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Lerche, Thomas and Gruber, Hans (2003) Virtual learning in educational science. In: Nistor, Nicolae and English, S. and Wheeler, S. and Jalobeanu, M., (eds.) Toward the virtual university : international online perspectives. Information Age Pub, Greenwich, Conn., 159–173. ISBN 1-931576-93-9( (print), 978-1-931576-93-2 (ebook).