TY  - JOUR
AU  - S. T. Zavalishchin
TI  - On the question of the general form of a linear equation. I, II
JO  - Differencialʹnye uravneniâ
PY  - 1971
SP  - 981
EP  - 989
VL  - 7
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1971_7_6_a3/
LA  - ru
ID  - DE_1971_7_6_a3
ER  -