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Winiecki, D., Fenner, J.A. & Chyung, Y. (1999). Evaluation of Effective Interventions to Solve the Drop out Problem in Adult Distance Education. In B. Collis & R. Oliver (Eds.), Proceedings of ED-MEDIA 1999--World Conference on Educational Multimedia, Hypermedia & Telecommunications (pp. 51-55). Seattle, WA USA: Association for the Advancement of Computing in Education (AACE).