TY - JOUR AU - A. I. Perov TI - On the theory of multidimensional differential equations with constant coefficients JO - Differencialʹnye uravneniâ PY - 1968 SP - 1289 EP - 1298 VL - 4 IS - 7 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1968_4_7_a12/ LA - ru ID - DE_1968_4_7_a12 ER -