TY  - JOUR
AU  - V. G. Litvinov
TI  - A modification of the Ritz method for variational equations and its applications to boundary value problems with mixed boundary conditions
JO  - Differencialʹnye uravneniâ
PY  - 1981
SP  - 519
EP  - 526
VL  - 17
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1981_17_3_a9/
LA  - ru
ID  - DE_1981_17_3_a9
ER  -