TY  - JOUR
AU  - M. D. Kovalenko
TI  - Biorthogonal expansions in eigenfunctions. I
JO  - Differencialʹnye uravneniâ
PY  - 1987
SP  - 1764
EP  - 1772
VL  - 23
IS  - 10
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1987_23_10_a12/
LA  - ru
ID  - DE_1987_23_10_a12
ER  -