By T.S. Blyth
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By Marek Capinski, Peter E. Kopp
By K. Erdmann, Mark J. Wildon
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By Lester L. Helms
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By Rudiger U. Seydel
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By Hans Wilhelm Alt, Robert Nurnberg
By Ian M. Chiswell
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By Alexandr A. Borovkov
By James N. Webb
By Achim Klenke
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