TY - JOUR AU - N. P. Erugin TI - Revisions in Section 5, Chapter XIII of A reader for a general course in differential equations JO - Differencialʹnye uravneniâ PY - 1979 SP - 1894 EP - 1897 VL - 15 IS - 10 UR - http://geodesic.mathdoc.fr/item/DE_1979_15_10_a17/ LA - ru ID - DE_1979_15_10_a17 ER -