TY  - BOOK
AU  - Lavrentev, M A
AU  - Radok, J R, Tr.
TI  - Variational methods : for boundary value problems for systems of elliptic equations
SN  - 486661709
CY  - New York
KW  - Boundary value problems
KW  - Calculus -- Variations
KW  - Conformal mappings
N1  - Includes bibliographical references and index
ER  -