TY  - BOOK
AU  - Belgacem, Fethi
TI  - Elliptic boundary value problems with indefinite weights: variational formulations of the principal eignevalue and applications
T2  - Pitman research notes in mathematics series
SN  - 0582315972
U1  - 515.35 
PY  - 1997///
CY  - England
PB  - Addison Wesley Longman Limited
ER  -