Edith Cohen Michal Feldman Amos Fiat Haim Kaplan Svetlana Olonetsky Envy-free makespan approximation: extended abstract. 159-166 2010 ACM Conference on Electronic Commerce http://doi.acm.org/10.1145/1807342.1807368 conf/sigecom/2010 db/conf/sigecom/sigecom2010.html#CohenFFKO10