Nitin Gupta 0003 Alan J. Demers Johannes Gehrke SEMMO: a scalable engine for massively multiplayer online games. 1235-1238 2008 SIGMOD Conference http://doi.acm.org/10.1145/1376616.1376743 conf/sigmod/2008 db/conf/sigmod/sigmod2008.html#GuptaDG08