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R. Slavin. Neue Perspektiven der Kooperation – ausgewählte Beiträge der Internationalen Konferenz 1992 über kooperatives Lernen, стр. 51-170. Hohengehren, Schneider, (1993)
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F. Wang. Proceedings of World Conference on Educational Multimedia, Hypermedia and Telecommunications 2002, стр. 2005--2006. Denver, Colorado, USA, AACE, (2002)