TY  - JOUR
AU  - Peter Hess
TI  - An Isoperimetric Inequality for the Principal Eigenvalue of a Periodic-Parabolic Problem.
JO  - Mathematische Zeitschrift
PY  - 1987
SP  - 121
EP  - 126
VL  - 194
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZ_1987__194_173821/
ID  - MZ_1987__194_173821
ER  -