@article{DE_1973_9_11_a9,
     author = {L. P. Sulima},
     title = {On the theory of the second order differential equation of degree two},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2010--2019},
     publisher = {mathdoc},
     volume = {9},
     number = {11},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_11_a9/}
}