@article{DE_2006_42_1_a3,
     author = {D. L. Kudryavtsev},
     title = {On the asymptotic expansion of a solution of a linear second-order differential equation with respect to a parameter},
     journal = {Differencialʹnye uravneni\^a},
     pages = {33--47},
     publisher = {mathdoc},
     volume = {42},
     number = {1},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2006_42_1_a3/}
}