Geodesic
Tangentially degenerate surfaces
Doklady Akademii Nauk, Tome 135 (1960) no. 1, pp. 20-22.

Voir la notice de l'article provenant de la source Math-Net.Ru

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     author = {V. V. Ryzhkov},
     title = {Tangentially degenerate surfaces},
     journal = {Doklady Akademii Nauk},
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     publisher = {mathdoc},
     volume = {135},
     number = {1},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_135_1_a3/}
}
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V. V. Ryzhkov. Tangentially degenerate surfaces. Doklady Akademii Nauk, Tome 135 (1960) no. 1, pp. 20-22. http://geodesic.mathdoc.fr/item/DAN_1960_135_1_a3/