@article{AIF_2009__59_2_515_0, author = {Pacard, Frank and Sicbaldi, Pieralberto}, title = {Extremal domains for the first eigenvalue of the {Laplace-Beltrami} operator}, journal = {Annales de l'Institut Fourier}, pages = {515--542}, publisher = {Association des Annales de l{\textquoteright}institut Fourier}, volume = {59}, number = {2}, year = {2009}, doi = {10.5802/aif.2438}, mrnumber = {2521426}, zbl = {1166.53029}, language = {en}, url = {https://aif.centre-mersenne.org/articles/10.5802/aif.2438/} }