Records |
Author |
Mario Rojas; David Masip; A. Todorov; Jordi Vitria |
Title |
Automatic Prediction of Facial Trait Judgments: Appearance vs. Structural Models |
Type |
Journal Article |
Year |
2011 |
Publication |
PloS one |
Abbreviated Journal |
Plos |
Volume |
6 |
Issue |
8 |
Pages |
e23323 |
Keywords |
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Abstract |
JCR Impact Factor 2010: 4.411
Evaluating other individuals with respect to personality characteristics plays a crucial role in human relations and it is the focus of attention for research in diverse fields such as psychology and interactive computer systems. In psychology, face perception has been recognized as a key component of this evaluation system. Multiple studies suggest that observers use face information to infer personality characteristics. Interactive computer systems are trying to take advantage of these findings and apply them to increase the natural aspect of interaction and to improve the performance of interactive computer systems. Here, we experimentally test whether the automatic prediction of facial trait judgments (e.g. dominance) can be made by using the full appearance information of the face and whether a reduced representation of its structure is sufficient. We evaluate two separate approaches: a holistic representation model using the facial appearance information and a structural model constructed from the relations among facial salient points. State of the art machine learning methods are applied to a) derive a facial trait judgment model from training data and b) predict a facial trait value for any face. Furthermore, we address the issue of whether there are specific structural relations among facial points that predict perception of facial traits. Experimental results over a set of labeled data (9 different trait evaluations) and classification rules (4 rules) suggest that a) prediction of perception of facial traits is learnable by both holistic and structural approaches; b) the most reliable prediction of facial trait judgments is obtained by certain type of holistic descriptions of the face appearance; and c) for some traits such as attractiveness and extroversion, there are relationships between specific structural features and social perceptions |
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Public Library of Science |
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Notes |
OR;MV |
Approved |
no |
Call Number |
Admin @ si @ RMT2011 |
Serial |
1883 |
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Author |
Miguel Angel Bautista; Sergio Escalera; Xavier Baro; Oriol Pujol; Jordi Vitria; Petia Radeva |
Title |
On the Design of Low Redundancy Error-Correcting Output Codes |
Type |
Book Chapter |
Year |
2011 |
Publication |
Ensembles in Machine Learning Applications |
Abbreviated Journal |
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Volume |
373 |
Issue |
2 |
Pages |
21-38 |
Keywords |
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Abstract |
The classification of large number of object categories is a challenging trend in the Pattern Recognition field. In the literature, this is often addressed using an ensemble of classifiers . In this scope, the Error-Correcting Output Codes framework has demonstrated to be a powerful tool for combining classifiers. However, most of the state-of-the-art ECOC approaches use a linear or exponential number of classifiers, making the discrimination of a large number of classes unfeasible. In this paper, we explore and propose a compact design of ECOC in terms of the number of classifiers. Evolutionary computation is used for tuning the parameters of the classifiers and looking for the best compact ECOC code configuration. The results over several public UCI data sets and different multi-class Computer Vision problems show that the proposed methodology obtains comparable (even better) results than the state-of-the-art ECOC methodologies with far less number of dichotomizers. |
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Publisher |
Springer Berlin Heidelberg |
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Edition |
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ISSN |
1860-949X |
ISBN |
978-3-642-22909-1 |
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Conference |
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Notes |
MILAB; OR;HuPBA;MV |
Approved |
no |
Call Number |
Admin @ si @ BEB2011b |
Serial |
1886 |
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Author |
Ruth Aylett; Ginevra Castellano; Bogdan Raducanu; Ana Paiva; Marc Hanheide |
Title |
Long-term socially perceptive and interactive robot companions: challenges and future perspectives |
Type |
Conference Article |
Year |
2011 |
Publication |
13th International Conference on Multimodal Interaction |
Abbreviated Journal |
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Volume |
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Issue |
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Pages |
323-326 |
Keywords |
human-robot interaction, multimodal interaction, social robotics |
Abstract |
This paper gives a brief overview of the challenges for multi-model perception and generation applied to robot companions located in human social environments. It reviews the current position in both perception and generation and the immediate technical challenges and goes on to consider the extra issues raised by embodiment and social context. Finally, it briefly discusses the impact of systems that must function continually over months rather than just for a few hours. |
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Alicante |
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Publisher |
ACM |
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ISBN |
978-1-4503-0641-6 |
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Area |
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Expedition |
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Conference |
ICMI |
Notes |
OR;MV |
Approved |
no |
Call Number |
Admin @ si @ ACR2011 |
Serial |
1888 |
Permanent link to this record |
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Author |
Antonio Hernandez; Carlos Primo; Sergio Escalera |
Title |
Automatic user interaction correction via Multi-label Graph cuts |
Type |
Conference Article |
Year |
2011 |
Publication |
In ICCV 2011 1st IEEE International Workshop on Human Interaction in Computer Vision HICV |
Abbreviated Journal |
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Volume |
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Issue |
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Pages |
1276-1281 |
Keywords |
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Abstract |
Most applications in image segmentation requires from user interaction in order to achieve accurate results. However, user wants to achieve the desired segmentation accuracy reducing effort of manual labelling. In this work, we extend standard multi-label α-expansion Graph Cut algorithm so that it analyzes the interaction of the user in order to modify the object model and improve final segmentation of objects. The approach is inspired in the fact that fast user interactions may introduce some pixel errors confusing object and background. Our results with different degrees of user interaction and input errors show high performance of the proposed approach on a multi-label human limb segmentation problem compared with classical α-expansion algorithm. |
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ISSN |
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ISBN |
978-1-4673-0062-9 |
Medium |
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Area |
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Expedition |
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Conference |
HICV |
Notes |
MILAB; HuPBA |
Approved |
no |
Call Number |
Admin @ si @ HPE2011 |
Serial |
1892 |
Permanent link to this record |
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Author |
Miguel Reyes; Gabriel Dominguez; Sergio Escalera |
Title |
Feature Weighting in Dynamic Time Warping for Gesture Recognition in Depth Data |
Type |
Conference Article |
Year |
2011 |
Publication |
1st IEEE Workshop on Consumer Depth Cameras for Computer Vision |
Abbreviated Journal |
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Volume |
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Issue |
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Pages |
1182-1188 |
Keywords |
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Abstract |
We present a gesture recognition approach for depth video data based on a novel Feature Weighting approach within the Dynamic Time Warping framework. Depth features from human joints are compared through video sequences using Dynamic Time Warping, and weights are assigned to features based on inter-intra class gesture variability. Feature Weighting in Dynamic Time Warping is then applied for recognizing begin-end of gestures in data sequences. The obtained results recognizing several gestures in depth data show high performance compared with classical Dynamic Time Warping approach. |
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ISBN |
978-1-4673-0062-9 |
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Area |
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Expedition |
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Conference |
CDC4CV |
Notes |
HuPBA;MILAB |
Approved |
no |
Call Number |
Admin @ si @ RDE2011 |
Serial |
1893 |
Permanent link to this record |
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Author |
Michal Drozdzal; Santiago Segui; Petia Radeva; Jordi Vitria; Laura Igual |
Title |
System and Method for Displaying Motility Events in an in Vivo Image Stream |
Type |
Patent |
Year |
2011 |
Publication |
US 61/592,786 |
Abbreviated Journal |
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Volume |
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Issue |
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Pages |
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Keywords |
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Abstract |
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Address |
Given Imaging |
Corporate Author |
US Patent Office |
Thesis |
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Notes |
MILAB; OR;MV |
Approved |
no |
Call Number |
Admin @ si @ DSR2011 |
Serial |
1897 |
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Author |
Alejandro Gonzalez Alzate |
Title |
Evaluation of spatiotemporal descriptors for pedestrian detection in video sequences |
Type |
Report |
Year |
2011 |
Publication |
CVC Technical Report |
Abbreviated Journal |
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Volume |
166 |
Issue |
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Pages |
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Keywords |
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Abstract |
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Address |
Bellaterra (Spain) |
Corporate Author |
Computer Vision Center |
Thesis |
Master's thesis |
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ADAS |
Approved |
no |
Call Number |
Admin @ si @ Gon2011 |
Serial |
1932 |
Permanent link to this record |
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Author |
Yainuvis Socarras |
Title |
Image segmentation for improving pedestrian detection |
Type |
Report |
Year |
2011 |
Publication |
CVC Technical Report |
Abbreviated Journal |
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Volume |
167 |
Issue |
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Pages |
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Abstract |
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Address |
Bellaterra (Spain) |
Corporate Author |
Computer Vision Center |
Thesis |
Master's thesis |
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Notes |
ADAS; |
Approved |
no |
Call Number |
Admin @ si @ Soc2011 |
Serial |
1933 |
Permanent link to this record |
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Author |
Maria del Camp Davesa |
Title |
Human action categorization in image sequences |
Type |
Report |
Year |
2011 |
Publication |
CVC Technical Report |
Abbreviated Journal |
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Volume |
169 |
Issue |
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Pages |
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Keywords |
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Abstract |
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Address |
Bellaterra (Spain) |
Corporate Author |
Computer Vision Center |
Thesis |
Master's thesis |
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Notes |
CiC;CIC |
Approved |
no |
Call Number |
Admin @ si @ Dav2011 |
Serial |
1934 |
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Author |
Marçal Rusiñol; R.Roset; Josep Llados; C.Montaner |
Title |
Automatic Index Generation of Digitized Map Series by Coordinate Extraction and Interpretation |
Type |
Conference Article |
Year |
2011 |
Publication |
In Proceedings of the Sixth International Workshop on Digital Technologies in Cartographic Heritage |
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Conference |
CartoHerit |
Notes |
DAG |
Approved |
no |
Call Number |
Admin @ si @ RRL2011b |
Serial |
1978 |
Permanent link to this record |
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Author |
Jaime Moreno; Xavier Otazu |
Title |
Image compression algorithm based on Hilbert scanning of embedded quadTrees: an introduction of the Hi-SET coder |
Type |
Conference Article |
Year |
2011 |
Publication |
IEEE International Conference on Multimedia and Expo |
Abbreviated Journal |
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Volume |
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Issue |
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Pages |
1-6 |
Keywords |
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Abstract |
In this work we present an effective and computationally simple algorithm for image compression based on Hilbert Scanning of Embedded quadTrees (Hi-SET). It allows to represent an image as an embedded bitstream along a fractal function. Embedding is an important feature of modern image compression algorithms, in this way Salomon in [1, pg. 614] cite that another feature and perhaps a unique one is the fact of achieving the best quality for the number of bits input by the decoder at any point during the decoding. Hi-SET possesses also this latter feature. Furthermore, the coder is based on a quadtree partition strategy, that applied to image transformation structures such as discrete cosine or wavelet transform allows to obtain an energy clustering both in frequency and space. The coding algorithm is composed of three general steps, using just a list of significant pixels. The implementation of the proposed coder is developed for gray-scale and color image compression. Hi-SET compressed images are, on average, 6.20dB better than the ones obtained by other compression techniques based on the Hilbert scanning. Moreover, Hi-SET improves the image quality in 1.39dB and 1.00dB in gray-scale and color compression, respectively, when compared with JPEG2000 coder. |
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ISSN |
1945-7871 |
ISBN |
978-1-61284-348-3 |
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Conference |
ICME |
Notes |
CIC |
Approved |
no |
Call Number |
Admin @ si @ MoO2011a |
Serial |
2176 |
Permanent link to this record |
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Author |
Jaime Moreno; Xavier Otazu |
Title |
Image coder based on Hilbert scanning of embedded quadTrees |
Type |
Conference Article |
Year |
2011 |
Publication |
Data Compression Conference |
Abbreviated Journal |
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Volume |
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Issue |
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Pages |
470-470 |
Keywords |
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Abstract |
In this work we present an effective and computationally simple algorithm for image compression based on Hilbert Scanning of Embedded quadTrees (Hi-SET). It allows to represent an image as an embedded bitstream along a fractal function. Embedding is an important feature of modern image compression algorithms, in this way Salomon in [1, pg. 614] cite that another feature and perhaps a unique one is the fact of achieving the best quality for the number of bits input by the decoder at any point during the decoding. Hi-SET possesses also this latter feature. Furthermore, the coder is based on a quadtree partition strategy, that applied to image transformation structures such as discrete cosine or wavelet transform allows to obtain an energy clustering both in frequency and space. The coding algorithm is composed of three general steps, using just a list of significant pixels. |
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DCC |
Notes |
CIC |
Approved |
no |
Call Number |
Admin @ si @ MoO2011b |
Serial |
2177 |
Permanent link to this record |
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Author |
Mirko Arnold; Stephan Ameling; Anarta Ghosh; Gerard Lacey |
Title |
Quality Improvement of Endoscopy Videos |
Type |
Conference Article |
Year |
2011 |
Publication |
Proceedings of the 8th IASTED International Conference on Biomedical Engineering |
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Volume |
723 |
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Area |
800 |
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Notes |
MV |
Approved |
no |
Call Number |
fernando @ fernando @ |
Serial |
2426 |
Permanent link to this record |
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Author |
Victor Ponce; Mario Gorga; Xavier Baro; Petia Radeva; Sergio Escalera |
Title |
Análisis de la expresión oral y gestual en proyectos fin de carrera vía un sistema de visión artificial |
Type |
Journal Article |
Year |
2011 |
Publication |
ReVisión |
Abbreviated Journal |
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Volume |
4 |
Issue |
1 |
Pages |
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Keywords |
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Abstract |
La comunicación y expresión oral es una competencia de especial relevancia en el EEES. No obstante, en muchas enseñanzas superiores la puesta en práctica de esta competencia ha sido relegada principalmente a la presentación de proyectos fin de carrera. Dentro de un proyecto de innovación docente, se ha desarrollado una herramienta informática para la extracción de información objetiva para el análisis de la expresión oral y gestual de los alumnos. El objetivo es dar un “feedback” a los estudiantes que les permita mejorar la calidad de sus presentaciones. El prototipo inicial que se presenta en este trabajo permite extraer de forma automática información audiovisual y analizarla mediante técnicas de aprendizaje. El sistema ha sido aplicado a 15 proyectos fin de carrera y 15 exposiciones dentro de una asignatura de cuarto curso. Los resultados obtenidos muestran la viabilidad del sistema para sugerir factores que ayuden tanto en el éxito de la comunicación así como en los criterios de evaluación. |
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1989-1199 |
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Notes |
HuPBA; MILAB;MV |
Approved |
no |
Call Number |
Admin @ si @ PGB2011d |
Serial |
2514 |
Permanent link to this record |
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Author |
Nataliya Shapovalova; Carles Fernandez; Xavier Roca; Jordi Gonzalez |
Title |
Semantics of Human Behavior in Image Sequences |
Type |
Book Chapter |
Year |
2011 |
Publication |
Computer Analysis of Human Behavior |
Abbreviated Journal |
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Volume |
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Issue |
7 |
Pages |
151-182 |
Keywords |
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Abstract |
Human behavior is contextualized and understanding the scene of an action is crucial for giving proper semantics to behavior. In this chapter we present a novel approach for scene understanding. The emphasis of this work is on the particular case of Human Event Understanding. We introduce a new taxonomy to organize the different semantic levels of the Human Event Understanding framework proposed. Such a framework particularly contributes to the scene understanding domain by (i) extracting behavioral patterns from the integrative analysis of spatial, temporal, and contextual evidence and (ii) integrative analysis of bottom-up and top-down approaches in Human Event Understanding. We will explore how the information about interactions between humans and their environment influences the performance of activity recognition, and how this can be extrapolated to the temporal domain in order to extract higher inferences from human events observed in sequences of images. |
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Springer London |
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Editor |
Albert Ali Salah; |
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978-0-85729-993-2 |
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ISE |
Approved |
no |
Call Number |
Admin @ si @ SFR2011 |
Serial |
1810 |
Permanent link to this record |