Lines of curvature and umbilic points on surfaces
Séminaire de théorie spectrale et géométrie, Volume 10 (1991-1992), pp. 9-12. 
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     language = {en},
     url = {https://tsg.centre-mersenne.org/articles/10.5802/tsg.95/}
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Jorge Sotomayor. Lines of curvature and umbilic points on surfaces. Séminaire de théorie spectrale et géométrie, Volume 10 (1991-1992), pp. 9-12. doi : 10.5802/tsg.95. https://tsg.centre-mersenne.org/articles/10.5802/tsg.95/

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