TY - JOUR AU - B. A. Shcherbakov AU - L. V. Koreneva TI - The preservation of the nature of the recurrence of the solutions of differential equations under perturbations JO - Differencialʹnye uravneniâ PY - 1974 SP - 470 EP - 475 VL - 10 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1974_10_3_a8/ LA - ru ID - DE_1974_10_3_a8 ER -