@article{GDZPPN002100002,
title = {On the lowest eigenvalue of the Laplacian for the intersection of two domains.},
journal = {Inventiones mathematicae},
volume = {74},
year = {1983},
pages = {441-448},
zbl = {0538.35058},
url = {http://dml.mathdoc.fr/item/GDZPPN002100002}
}
Lieb, Elliott H. On the lowest eigenvalue of the Laplacian for the intersection of two domains.. Inventiones mathematicae, Tome 74 (1983) pp. 441-448. http://gdmltest.u-ga.fr/item/GDZPPN002100002/