@article{00753680,
title = {On the spectrum of the negative Laplacian for general doubly-connected bounded domains.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {18},
year = {1995},
pages = {245-254},
doi = {10.1155/S0161171295000305},
zbl = {0829.35090},
language = {en},
url = {http://dml.mathdoc.fr/item/00753680}
}
Zayed, E.M.E.; Younis, A.I. On the spectrum of the negative Laplacian for general doubly-connected bounded domains.. International Journal of Mathematics and Mathematical Sciences, Tome 18 (1995) pp. 245-254. doi : 10.1155/S0161171295000305. http://gdmltest.u-ga.fr/item/00753680/