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Herrn Emanuel Sperner zum 60. Geburtstag am 9. Dezember 1965 gewidmet
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Pickert, G. Die cartesischen Gruppen der Ostrom-Rosati-Ebenen. Abh.Math.Semin.Univ.Hambg. 30, 106–117 (1967). https://doi.org/10.1007/BF02993994
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DOI: https://doi.org/10.1007/BF02993994