Gruppenartige Multigruppen
Karel Drbohlav (1957)
Czechoslovak Mathematical Journal
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Karel Drbohlav (1957)
Czechoslovak Mathematical Journal
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Bolzano, Bernard
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Siegfried Hahn (1979)
Commentationes Mathematicae Universitatis Carolinae
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Sillke, Torsten (1989)
Séminaire Lotharingien de Combinatoire [electronic only]
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Stefan Straszewicz (1925)
Fundamenta Mathematicae
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K. Denecke (1982)
Banach Center Publications
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