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@article{MM2_1990__69_1_155556, author = {Pierre B\'erard}, title = {A lower bound for the least eigenvalue of ... + {V.}}, journal = {Manuscripta mathematica}, pages = {255--260}, publisher = {mathdoc}, volume = {69}, number = {1}, year = {1990}, zbl = {0717.58056}, url = {http://geodesic.mathdoc.fr/item/MM2_1990__69_1_155556/} }
Pierre Bérard. A lower bound for the least eigenvalue of ... + V.. Manuscripta mathematica, Tome 69 (1990) no. 1, pp. 255-260. http://geodesic.mathdoc.fr/item/MM2_1990__69_1_155556/