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[Baader99] Baader, F. and Nipkow, T., Term Rewriting and All That, Cambridge University Press, 1999. http://books.google.com/books?id=N7BvXVUCQk8C
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[Turchin89] Turchin, V. F., REFAL-5 Programming Guide and Reference Manual, The City College of New York, New England Publishing Co., Holyoke., 1989.
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