TY - JOUR AU - A. E. Gel'man TI - A test for the existence of certain classes of solutions of a non-linear differential equation and some estimates JO - Doklady Akademii Nauk PY - 1958 SP - 1063 EP - 1065 VL - 118 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1958_118_6_a2/ LA - ru ID - DAN_1958_118_6_a2 ER -