Geodesic
Singular points for two-dimensional systems of total differential equations in four-dimensional space
Differencialʹnye uravneniâ, Tome 4 (1968) no. 10, pp. 1835-1841 
R. G. Dymanov. Singular points for two-dimensional systems of total differential equations in four-dimensional space. Differencialʹnye uravneniâ, Tome 4 (1968) no. 10, pp. 1835-1841. http://geodesic.mathdoc.fr/item/DE_1968_4_10_a7/
@article{DE_1968_4_10_a7,
     author = {R. G. Dymanov},
     title = {Singular points for two-dimensional systems of total differential equations in four-dimensional space},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1835--1841},
     year = {1968},
     volume = {4},
     number = {10},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_10_a7/}
}
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