TY  - BOOK
AU  - Lavrentev, M.A.
TI  - Variational methods for boundary value problems for systems of elliptic equations
SN  - 9780486661704
U1  - 517.951 
PY  - 1167///
CY  - New York
PB  - Dover Publications
KW  - MATHEMATICS
KW  - VARIATIONAL METHODS
ER  -