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Emanuel Sperner zum 65. Geburtstag gewidmet
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Havel, V. Nichtinjektive Homomorphismen von Viergeweben. Abh.Math.Semin.Univ.Hambg. 37, 6–19 (1972). https://doi.org/10.1007/BF02993895
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DOI: https://doi.org/10.1007/BF02993895