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Veltman, K.H.: Frontiers in conceptual navigation (1997)
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Veltman, K.: Frontiers in conceptual navigation (1998)
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Peitgen, H.-O.; Jürgens, H.; Saupe, D.: Chaos and fractals : new frontiers of science (1992)
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Jonassen, D.H.: Conceptual frontiers in hypermedia environments for learning (1993)
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Veltman, K.: Computers and a new philosophy of knowledge (1991)
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