TY  - JOUR
AU  - A. A. Shishkin
TI  - Eigen-values and characteristic functions of some fourth order differential operators containing a small parameter in the higher derivative term
JO  - Doklady Akademii Nauk
PY  - 1958
SP  - 249
EP  - 251
VL  - 123
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1958_123_2_a9/
LA  - ru
ID  - DAN_1958_123_2_a9
ER  -