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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     author = {Jorge Sotomayor},
     title = {Lines of curvature and umbilic points on surfaces},
     journal = {S\'eminaire de th\'eorie spectrale et g\'eom\'etrie},
     pages = {9--12},
     year = {1991-1992},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {10},
     doi = {10.5802/tsg.95},
     mrnumber = {1715907},
     language = {en},
     url = {https://proceedings.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, Tome 10 (1991-1992), pp. 9-12. doi: 10.5802/tsg.95

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