TY  - JOUR
AU  - È. M. Saak
TI  - Fredholm property of a class of boundary value problems
JO  - Differencialʹnye uravneniâ
PY  - 1980
SP  - 507
EP  - 515
VL  - 16
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1980_16_3_a14/
LA  - ru
ID  - DE_1980_16_3_a14
ER  -