A. Björner, L. Lovász: Chip-Firing Games on Directed Graphs. Journal of Algebraic Combinatorics, December 1992, Volume 1, Issue 4, pp 305–328 doi:10.1023/A:1022467132614PDF
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A. Björner, L. Lovász, P. W. Shor: Chip-firing games on graphs. European Journal of Combinatorics archive, Volume 12 Issue 4, July 1991, Pages 283-291 doi:10.1016/S0195-6698(13)80111-4PDF
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A. Björner, L. Lovász: Chip-Firing Games on Directed Graphs. Journal of Algebraic Combinatorics, December 1992, Volume 1, Issue 4, pp 305–328 doi:10.1023/A:1022467132614PDF
A. Björner, L. Lovász, P. W. Shor: Chip-firing games on graphs. European Journal of Combinatorics archive, Volume 12 Issue 4, July 1991, Pages 283-291 doi:10.1016/S0195-6698(13)80111-4PDF
K. Eriksson, No polynomial bound for the chip-firing game on directed graphs, Proc. Amer. Math. Soc. 112 (1991), 1203–1205. doi:10.2307/2048674PDF[halott link]
K. Eriksson, No polynomial bound for the chip-firing game on directed graphs, Proc. Amer. Math. Soc. 112 (1991), 1203–1205. doi:10.2307/2048674PDF[halott link]
