TY  - JOUR
AU  - M. A. Krasnosel'skii
AU  - E. A. Livshitz
TI  - Duality principles for boundary value problems
JO  - Doklady Akademii Nauk
PY  - 1967
SP  - 999
EP  - 1001
VL  - 176
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1967_176_5_a5/
LA  - ru
ID  - DAN_1967_176_5_a5
ER  -