1. Disks, balls, and walls: analysis of a combinatorial game;Anderson;Amer. Math. Monthly,1989
2. Parallel chip firing games on graphs;Bitar;Theoret. Comput. Sci.,1992
3. Chip-firing games on directed graphs;Björner;J. Algebra. Combinator.,1992
4. Chip-firing games on graphs;Björner;European J. Combinator.,1991
5. H. Eriksson, K. Eriksson, Chip firing and Coxeter elements, Proceedings 6th Conference on Formal power series and algebraic combinatorics, FPSAC 94, 1994, pp. 145–151.