@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},
     zbl = {1166.53029},
     mrnumber = {2521426},
     language = {en},
     url = {http://archive.numdam.org/articles/10.5802/aif.2438/}
}