@article{DE_1967_3_6_a16,
     author = {A. N. Erugin},
     title = {The structure of a solution of the equation $u'=U_0(\nu)u+\sum_{n=1}^\infty(\nu)u^{1+\alpha_n}\equiv U(u,\nu)$ in a small 
},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1029--1030},
     publisher = {mathdoc},
     volume = {3},
     number = {6},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_6_a16/}
}