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    ".. [Lee94] T.-C. Lee, R.L. Kashyap and C.-N. Chu, Building skeleton models",
    "       via 3-D medial surface/axis thinning algorithms.",
    "       Computer Vision, Graphics, and Image Processing, 56(6):462-478, 1994.",
    "",
    ".. [Zha84] A fast parallel algorithm for thinning digital patterns,",
    "       T. Y. Zhang and C. Y. Suen, Communications of the ACM,",
    "       March 1984, Volume 27, Number 3."
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