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Yaorong Ge J. Michael Fitzpatrick On the Generation of Skeletons from Discrete Euclidean Distance Maps. 1055-1066 1996 18 IEEE Trans. Pattern Anal. Mach. Intell. 11 https://doi.org/10.1109/34.544075 http://doi.ieeecomputersociety.org/10.1109/34.544075 db/journals/pami/pami18.html#GeF96