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\bibitem{2724} M. Campos-Taberner, Adriana Romero, Carlo Gatta, \& Gustavo Camps-Valls. (2015). Shared feature representations of LiDAR and optical images: Trading sparsity for semantic discrimination. In \textit{IEEE International Geoscience and Remote Sensing Symposium IGARSS2015} (pp. 4169--4172).

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