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by Brieskorn, Egbert; Knorrer, Horst; Stillwell, John
by Brieskorn, Egbert; Knörrer, Horst
by Egbert Brieskorn; Walter Purkert
by Brieskorn, Egbert; Epple, Moritz
by Brieskorn, Egbert; Purkert, Walter
by Brieskorn, Egbert