TY - JOUR AU - V. E. Slyusarchuk TI - Problem of instability in the first approximation JO - Matematičeskie zametki PY - 1978 SP - 721 EP - 723 VL - 23 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_1978_23_5_a7/ LA - ru ID - MZM_1978_23_5_a7 ER -