Rajeev Alur Aldric Degorre Oded Maler Gera Weiss On Omega-Languages Defined by Mean-Payoff Conditions. 333-347 2009 FOSSACS http://dx.doi.org/10.1007/978-3-642-00596-1_24 conf/fossacs/2009 db/conf/fossacs/fossacs2009.html#AlurDMW09