@article{TSG_1986-1987__5__107_0,
     author = {Besson, G\'erard},
     title = {Sur la multiplicit\'e des valeurs propres du laplacien},
     journal = {S\'eminaire de th\'eorie spectrale et g\'eom\'etrie},
     pages = {107--132},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {5},
     year = {1986-1987},
     mrnumber = {1046247},
     zbl = {1002.58515},
     language = {fr},
     url = {http://www.numdam.org/item/TSG_1986-1987__5__107_0/}
}