Geodesic
The Cauchy problem for a second order linear equation with small parameter which degenerates in the limit to an equation with singular points
Differencialʹnye uravneniâ, Tome 5 (1969) no. 9, pp. 1583-1593 
A. B. Zimin. The Cauchy problem for a second order linear equation with small parameter which degenerates in the limit to an equation with singular points. Differencialʹnye uravneniâ, Tome 5 (1969) no. 9, pp. 1583-1593. http://geodesic.mathdoc.fr/item/DE_1969_5_9_a4/
@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},
     year = {1969},
     volume = {5},
     number = {9},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_9_a4/}
}
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