@Article{ alvbara, author = { Alvarez, Olivier and Bardi, Martino }, title = { Ergodic problems in differential games }, journal = { Ann. Internat. Soc. Dynam. Games }, year = { 2007 }, volume = { 9 }, pages = { 131-152 }, URL = { http://cvgmt.sns.it/paper/1371/ }, note = { cvgmt preprint} }