Geodesic
On surfaces and their contours.
Manuscripta mathematica, Tome 72 (1991) no. 1, pp. 223-250 Cet article a éte moissonné depuis la source European Digital Mathematics Library

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Mots-clés : apparent contours, projections, genus, winding numbers, cusp points 
@article{MM2_1991__72_1_155640,
     author = {Roberto Pignoni},
     title = {On surfaces and their contours.},
     journal = {Manuscripta mathematica},
     pages = {223--250},
     year = {1991},
     volume = {72},
     number = {1},
     zbl = {0736.53007},
     url = {http://geodesic.mathdoc.fr/item/MM2_1991__72_1_155640/}
}
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Roberto Pignoni. On surfaces and their contours.. Manuscripta mathematica, Tome 72 (1991) no. 1, pp. 223-250. http://geodesic.mathdoc.fr/item/MM2_1991__72_1_155640/