TY  - JOUR
AU  - L. M. Berkovich
TI  - Certain classes of difference and differential equations with variable coefficients
JO  - Izvestiâ vysših učebnyh zavedenij. Matematika
PY  - 1970
SP  - 13
EP  - 25
IS  - 7
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IVM_1970_7_a1/
LA  - ru
ID  - IVM_1970_7_a1
ER  -