Laura Itzel Florian Heger Gregor Schiele Christian Becker 0001 The quest for meaningful mobility in massively multi-user virtual environments. 1-2 2011 NETGAMES https://doi.org/10.1109/NetGames.2011.6080991 conf/netgames/2011 db/conf/netgames/netgames2011.html#ItzelHSB11