TY  - JOUR
AU  - M. D. Kovalenko
TI  - On a property of bi-orthogonal expansions in homogeneous solutions
JO  - Doklady Akademii Nauk
PY  - 1997
SP  - 193
EP  - 195
VL  - 352
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1997_352_2_a11/
LA  - ru
ID  - DAN_1997_352_2_a11
ER  -