Sufficient conditions for the absence of integral cycles of Pfaffian systems of manifolds
Differencialʹnye uravneniâ, Tome 6 (1970) no. 10, pp. 1896-1900.

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@article{DE_1970_6_10_a19,
     author = {V. S. Medvedev},
     title = {Sufficient conditions for the absence of integral cycles of {Pfaffian} systems of manifolds},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1896--1900},
     publisher = {mathdoc},
     volume = {6},
     number = {10},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1970_6_10_a19/}
}
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V. S. Medvedev. Sufficient conditions for the absence of integral cycles of Pfaffian systems of manifolds. Differencialʹnye uravneniâ, Tome 6 (1970) no. 10, pp. 1896-1900. http://geodesic.mathdoc.fr/item/DE_1970_6_10_a19/