Geodesic
Harmonic quadrics and certain ruled surfaces of congruences
Doklady Akademii Nauk, Tome 122 (1958) no. 3, pp. 335-338.

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

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     author = {S. E. Karapetyan},
     title = {Harmonic quadrics and certain ruled surfaces of congruences},
     journal = {Doklady Akademii Nauk},
     pages = {335--338},
     publisher = {mathdoc},
     volume = {122},
     number = {3},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_122_3_a2/}
}
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S. E. Karapetyan. Harmonic quadrics and certain ruled surfaces of congruences. Doklady Akademii Nauk, Tome 122 (1958) no. 3, pp. 335-338. http://geodesic.mathdoc.fr/item/DAN_1958_122_3_a2/