@article{05142614, title = {New bounds for the principal Dirichlet eigenvalue of planar regions.}, journal = {Experimental Mathematics}, volume = {15}, year = {2006}, pages = {333-342}, doi = {10.1080/10586458.2006.10128966}, zbl = {1180.35388}, language = {en}, url = {http://dml.mathdoc.fr/item/05142614} }
Antunes, Pedro; Freitas, Pedro. New bounds for the principal Dirichlet eigenvalue of planar regions.. Experimental Mathematics, Tome 15 (2006) pp. 333-342. doi : 10.1080/10586458.2006.10128966. http://gdmltest.u-ga.fr/item/05142614/