TY - JOUR AU - A. V. Neklyudov TI - Some qualitative methods in the course of ordinary differential equations JO - Matematičeskoe obrazovanie PY - 2024 SP - 22 EP - 29 VL - 109 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MO_2024_109_1_a3/ LA - ru ID - MO_2024_109_1_a3 ER -