@article{DE_1969_5_9_a4,
     author = {A. B. Zimin},
     title = {The {Cauchy} problem for a second order linear equation with small parameter which degenerates in the limit to an equation with singular points},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1583--1593},
     publisher = {mathdoc},
     volume = {5},
     number = {9},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_9_a4/}
}