Thompson, Mark K.; Weal, Mark J.; Michaelides, Danius T.; Cruickshank, Don G.; De Roure, David C. (2003). "MUD Slinging: Virtual Orchestration of Physical Interactions". University of Southampton ECSTRIAM03-007. CiteSeerX10.1.1.109.6617.{{cite journal}}: Cite uses deprecated parameter |citeseerx= (help),