Geodesic
The existence of a locally invariant surface for certain strongly nonlinear systems of differential equations
Differencialʹnye uravneniâ, Tome 8 (1972) no. 10, pp. 1772-1778 
V. N. Monakov. The existence of a locally invariant surface for certain strongly nonlinear systems of differential equations. Differencialʹnye uravneniâ, Tome 8 (1972) no. 10, pp. 1772-1778. http://geodesic.mathdoc.fr/item/DE_1972_8_10_a6/
@article{DE_1972_8_10_a6,
     author = {V. N. Monakov},
     title = {The existence of a locally invariant surface for certain strongly nonlinear systems of differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1772--1778},
     year = {1972},
     volume = {8},
     number = {10},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_10_a6/}
}
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