edited by Chris Jesshope, Vesselin Jossifov, Wolfgang Wilhelmi

Akademie Verlag c1994 Mathematical research = Mathematische Forschung 81

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edited by Leonid P. Yaroslavskiǐ, Azriel Rosenfeld, Wolfganag Wilhelmi

Akademie-Verlag 1987 Mathematical research = Mathematische Forschung Bd. 40

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