@article{JAC_1999__9_1_a2,
     author = {Biggs, N.L.},
     title = {Chip-firing and the critical group of a graph},
     journal = {Journal of Algebraic Combinatorics},
     pages = {25--45},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JAC_1999__9_1_a2/}
}