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@article{DE_1969_5_10_a14, author = {A. I. Perov}, title = {A certain generalization of the {Frobenius} theorem}, journal = {Differencialʹnye uravneni\^a}, pages = {1881--1884}, publisher = {mathdoc}, volume = {5}, number = {10}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1969_5_10_a14/} }
A. I. Perov. A certain generalization of the Frobenius theorem. Differencialʹnye uravneniâ, Tome 5 (1969) no. 10, pp. 1881-1884. http://geodesic.mathdoc.fr/item/DE_1969_5_10_a14/