%0 Journal Article %A N. F. Valeev %A E. A. Nazirova %A Ya. T. Sultanaev %T On a~new approach for studying asymptotic behavior of solutions to singular differential equations %J Ufa mathematical journal %D 2015 %P 9-14 %V 7 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/UFA_2015_7_3_a1/ %G en %F UFA_2015_7_3_a1