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\bibitem{2302} Carles Sanchez, Jorge Bernal, Debora Gil, \& F. Javier Sanchez. (2013). On-line lumen centre detection in gastrointestinal and respiratory endoscopy. In Klaus Miguel Angel and Drechsler Stefan and Gonz{\'a}lez Ballester Raj and Wesarg Cristina and Shekhar Marius George and Oyarzun Laura M. and L. Erdt (Ed.), \textit{Second International Workshop Clinical Image-Based Procedures} (Vol. 8361, pp. 31--38). LNCS. Springer International Publishing.

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