@article{TSG_1982-1983__1__A3_0,
     author = {Yves Colin de Verdi\`ere},
     title = {Sur les longueurs des trajectoires p\'eriodiques d'un billard},
     journal = {S\'eminaire de th\'eorie spectrale et g\'eom\'etrie},
     note = {talk:3},
     pages = {1--18},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {1},
     year = {1982-1983},
     doi = {10.5802/tsg.3},
     zbl = {1126.37307},
     language = {fr},
     url = {https://proceedings.centre-mersenne.org/articles/10.5802/tsg.3/}
}