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HerrnErich Kamke zum 70. Geburtstag am 18. August 1960 gewidmet
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Specht, W. Zur Theorie der elementaren Mittel. Math Z 74, 91–98 (1960). https://doi.org/10.1007/BF01180475
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DOI: https://doi.org/10.1007/BF01180475