Structurally stable configurations of lines of principal curvature
Bifurcation, théorie ergodique et applications - 22-26 juin 1981, Astérisque, no. 98-99 (1982), pp. 195-215 
@incollection{AST_1983__98-99__195_0,
     author = {Sotomayor, J. and Gutierrez, C.},
     title = {Structurally stable configurations of lines of principal curvature},
     booktitle = {Bifurcation, th\'eorie ergodique et applications - 22-26 juin 1981},
     series = {Ast\'erisque},
     pages = {195--215},
     year = {1982},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {98-99},
     mrnumber = {724448},
     zbl = {0521.53003},
     language = {en},
     url = {https://www.numdam.org/item/AST_1983__98-99__195_0/}
}
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Sotomayor, J.; Gutierrez, C. Structurally stable configurations of lines of principal curvature, dans Bifurcation, théorie ergodique et applications - 22-26 juin 1981, Astérisque, no. 98-99 (1982), pp. 195-215. https://www.numdam.org/item/AST_1983__98-99__195_0/

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