@article{BSMF_1995__123_4_517_0,
     author = {Bacher, Roland and Colin de Verdi\`ere, Yves},
     title = {Multiplicit\'es des valeurs propres et transformations \'etoile-triangle des graphes},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {517--533},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {123},
     number = {4},
     year = {1995},
     doi = {10.24033/bsmf.2269},
     mrnumber = {96k:05129},
     zbl = {0845.05068},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.24033/bsmf.2269/}
}