TY  - BOOK
AU  - Belgacem Fethi
TI  - Elliptic boundary value problems with indefinite weights : variational formulations of the principal eigenvalue and applications
SN  - 0-582-31597-2
U1  - 515.353 
PY  - 1997///
CY  - Essex
PB  - Longman
KW  - Boundary value problems
KW  - Eigenvalue problems
KW  - Elliptic equations
ER  -