TY  - JOUR
AU  - R. R. Mkrtumyan
TI  - A fourth-order linear equation
JO  - Differencialʹnye uravneniâ
PY  - 1979
SP  - 740
EP  - 742
VL  - 15
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1979_15_4_a21/
LA  - ru
ID  - DE_1979_15_4_a21
ER  -