Geodesic
Discrete groups of problems
Differencialʹnye uravneniâ, Tome 8 (1972) no. 2, pp. 380-382.

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

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     author = {E. N. Petrov},
     title = {Discrete groups of problems},
     journal = {Differencialʹnye uravneni\^a},
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     publisher = {mathdoc},
     volume = {8},
     number = {2},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_2_a20/}
}
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E. N. Petrov. Discrete groups of problems. Differencialʹnye uravneniâ, Tome 8 (1972) no. 2, pp. 380-382. http://geodesic.mathdoc.fr/item/DE_1972_8_2_a20/