TY - JOUR AU - A. A. Spektor TI - Qualitative properties and behavior in time of the solutions of JO - Doklady Akademii Nauk PY - 1988 SP - 1337 EP - 1340 VL - 301 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1988_301_6_a13/ LA - ru ID - DAN_1988_301_6_a13 ER -