@article{DAN_1958_118_6_a2,
     author = {A. E. Gel'man},
     title = {A test for the existence of certain classes of solutions of a non-linear differential equation and some estimates 
},
     journal = {Doklady Akademii Nauk},
     pages = {1063--1065},
     publisher = {mathdoc},
     volume = {118},
     number = {6},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_118_6_a2/}
}