@article{00894092, title = {Eigenvalues of the negative Laplacian for arbitrary multiply connected domains.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {19}, year = {1996}, pages = {581-586}, doi = {10.1155/S0161171296000804}, zbl = {0852.35108}, language = {en}, url = {http://dml.mathdoc.fr/item/00894092} }
Zayed, E.M.E. Eigenvalues of the negative Laplacian for arbitrary multiply connected domains.. International Journal of Mathematics and Mathematical Sciences, Tome 19 (1996) pp. 581-586. doi : 10.1155/S0161171296000804. http://gdmltest.u-ga.fr/item/00894092/