@article{DE_1980_16_4_a4,
     author = {F. Zh. Sadyrbaev},
     title = {Ljapunov functions and the solvability of the first boundary value problem for an ordinary second-order differential equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {629--634},
     publisher = {mathdoc},
     volume = {16},
     number = {4},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1980_16_4_a4/}
}