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Economou, Daphne and Mitchell, William L. and Boyle, Tom (1998) A phased approach to developing a set of requirements for the use of virtual actors in share virtual learning environments. In: Proceedings of ED-MEDIA & ED-TELECOM 98: 10th World Conference on Educational Multimedia and hypermedia & World Conference on Educational Telecommunications, Freiburg, Germany, 20-25 June 1998. Association for the Advancement of Computing in Education (AACE), pp. 1620-1621.