%0 Journal Article
%A Peter Hess
%T An Isoperimetric Inequality for the Principal Eigenvalue of a Periodic-Parabolic Problem.
%J Mathematische Zeitschrift
%D 1987
%P 121-126
%V 194
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZ_1987__194_173821/
%F MZ_1987__194_173821