@article{DE_1996_32_6_a0,
     author = {M. M. Aripov and D. S. Echmatov},
     title = {Asymptotic representations of solutions of a class of second-order nonlinear differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {723--730},
     publisher = {mathdoc},
     volume = {32},
     number = {6},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1996_32_6_a0/}
}