@article{DE_1972_8_2_a3,
     author = {\`E. I. Grudo},
     title = {The structure of the solutions of a certain system of two differential {equations.~II}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {230--242},
     publisher = {mathdoc},
     volume = {8},
     number = {2},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_2_a3/}
}