@article{CM_1973__27_1_83_0,
     author = {Colin de Verdi\`ere, Y.},
     title = {Spectre du laplacien et longueurs des g\'eod\'esiques p\'eriodiques. {I}},
     journal = {Compositio Mathematica},
     pages = {83--106},
     publisher = {Noordhoff International Publishing},
     volume = {27},
     number = {1},
     year = {1973},
     mrnumber = {348798},
     zbl = {0272.53034},
     language = {fr},
     url = {http://www.numdam.org/item/CM_1973__27_1_83_0/}
}