Geodesic
On the analytic theory of the equation $z^2u^{''}-f(z)u=0$.~I, II
Differencialʹnye uravneniâ, Tome 8 (1972) no. 11, pp. 1999-2011.

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     author = {V. K. Polishchuk},
     title = {On the analytic theory of the equation $z^2u^{''}-f(z)u=0${.~I,} {II}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1999--2011},
     publisher = {mathdoc},
     volume = {8},
     number = {11},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_11_a11/}
}
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V. K. Polishchuk. On the analytic theory of the equation $z^2u^{''}-f(z)u=0$.~I, II. Differencialʹnye uravneniâ, Tome 8 (1972) no. 11, pp. 1999-2011. http://geodesic.mathdoc.fr/item/DE_1972_8_11_a11/