@article{AIF_2007__57_7_2429_0,
     author = {Colin de Verdi\`ere, Yves},
     title = {Spectrum of the {Laplace} operator and periodic geodesics: thirty years after},
     journal = {Annales de l'Institut Fourier},
     pages = {2429--2463},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
     volume = {57},
     number = {7},
     year = {2007},
     doi = {10.5802/aif.2339},
     mrnumber = {2394548},
     zbl = {1142.35057},
     language = {en},
     url = {https://aif.centre-mersenne.org/articles/10.5802/aif.2339/}
}