@article{DE_1971_7_10_a2,
     author = {\`E. I. Grudo},
     title = {The structure of solutions of a certain system of two differential equations. {I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1765--1778},
     publisher = {mathdoc},
     volume = {7},
     number = {10},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_10_a2/}
}