%0 Journal Article %A N. P. Erugin %T The equations $w''=f(w',w,z)$ with an irrational right-hand side %J Differencialʹnye uravneniâ %D 1980 %P 236-250 %V 16 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1980_16_2_a5/ %G ru %F DE_1980_16_2_a5