Self Organized Criticality/Sandpile Models:

Universality in sandpile models,
A. Ben-Hur and O. Biham,
Phys. Rev. E53, R1317 (1996).
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Universality classes in isotropic, abelian
and non-abelian sandpile models.
E. Milshtein, O. Biham and S. Solomon,
Phys. Rev. E58, 303 (1998).
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Evidence for universality within the classes
of deterministic and stochastic sandpile models.
O. Biham, E. Milshtein and O. Malcai,
Phys. Rev. E63, 061309 (2001).

Sandpile models and random walkers on finite lattices.
Y. Shilo and O. Biham,
Phys. Rev. E67, 066102 (2003).
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