@article{CMH_1988__63_4_140119,
     author = {Marc Burger},
     title = {Sp\`ectre du {Laplacian,} graphes et topologie de {Fell.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {226--252},
     publisher = {mathdoc},
     volume = {63},
     number = {4},
     year = {1988},
     zbl = {0659.58048},
     url = {http://geodesic.mathdoc.fr/item/CMH_1988__63_4_140119/}
}