Lines of curvature and umbilic points on surfaces
Séminaire de théorie spectrale et géométrie, Tome 10 (1991-1992), pp. 9-12. 
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     address = {Grenoble},
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     year = {1991-1992},
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Sotomayor, Jorge. Lines of curvature and umbilic points on surfaces. Séminaire de théorie spectrale et géométrie, Tome 10 (1991-1992), pp. 9-12. http://archive.numdam.org/item/TSG_1991-1992__10__9_0/

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