Geodesic
The structure of solutions of a certain system of two differential equations. I
Differencialʹnye uravneniâ, Tome 7 (1971) no. 10, pp. 1765-1778 
È. I. Grudo. The structure of solutions of a certain system of two differential equations. I. Differencialʹnye uravneniâ, Tome 7 (1971) no. 10, pp. 1765-1778. http://geodesic.mathdoc.fr/item/DE_1971_7_10_a2/
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     author = {\`E. I. Grudo},
     title = {The structure of solutions of a certain system of two differential equations. {I}},
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     year = {1971},
     volume = {7},
     number = {10},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_10_a2/}
}
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