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@article{MZ_1981__176_183632, author = {Emanuel, Jr. Sperner}, title = {Spherical {Symmetrization} and {Eigenvalue} {Estimates.}}, journal = {Mathematische Zeitschrift}, pages = {75--86}, publisher = {mathdoc}, volume = {176}, year = {1981}, zbl = {0464.49009}, url = {http://geodesic.mathdoc.fr/item/MZ_1981__176_183632/} }
Emanuel, Jr. Sperner. Spherical Symmetrization and Eigenvalue Estimates.. Mathematische Zeitschrift, Tome 176 (1981), pp. 75-86. http://geodesic.mathdoc.fr/item/MZ_1981__176_183632/