Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MZ_1987__194_173821, author = {Peter Hess}, title = {An {Isoperimetric} {Inequality} for the {Principal} {Eigenvalue} of a {Periodic-Parabolic} {Problem.}}, journal = {Mathematische Zeitschrift}, pages = {121--126}, publisher = {mathdoc}, volume = {194}, year = {1987}, zbl = {0629.35050}, url = {http://geodesic.mathdoc.fr/item/MZ_1987__194_173821/} }
Peter Hess. An Isoperimetric Inequality for the Principal Eigenvalue of a Periodic-Parabolic Problem.. Mathematische Zeitschrift, Tome 194 (1987), pp. 121-126. http://geodesic.mathdoc.fr/item/MZ_1987__194_173821/