TY - JOUR AU - V. V. Nemytskii TI - On certain methods of qualitative investigation ``in~the large'' of many-dimensional autonomous systems JO - Trudy Moskovskogo matematičeskogo obŝestva PY - 1956 SP - 455 EP - 482 VL - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MMO_1956_5_a10/ LA - ru ID - MMO_1956_5_a10 ER -