@article{IM_1991__104_1_143902,
     author = {Yves de Colin de Verdi\`ere},
     title = {Un principe variationnel pour les empilements de cercles.},
     journal = {Inventiones mathematicae},
     pages = {655--669},
     publisher = {mathdoc},
     volume = {104},
     number = {1},
     year = {1991},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/IM_1991__104_1_143902/}
}