Yossi Azar Benjamin E. Birnbaum L. Elisa Celis Nikhil R. Devanur Yuval Peres Convergence of Local Dynamics to Balanced Outcomes in Exchange Networks http://arxiv.org/abs/0907.4356 2009 CoRR abs/0907.4356 db/journals/corr/corr0907.html#abs-0907-4356 informal publication