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@article{IM_1983__74_143081, author = {Elliott H. Lieb}, title = {On the lowest eigenvalue of the {Laplacian} for the intersection of two domains.}, journal = {Inventiones mathematicae}, pages = {441--448}, publisher = {mathdoc}, volume = {74}, year = {1983}, zbl = {0538.35058}, url = {http://geodesic.mathdoc.fr/item/IM_1983__74_143081/} }
Elliott H. Lieb. On the lowest eigenvalue of the Laplacian for the intersection of two domains.. Inventiones mathematicae, Tome 74 (1983), pp. 441-448. http://geodesic.mathdoc.fr/item/IM_1983__74_143081/