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The author extends his appreciation to Prof.F. L. Bauer and Dr.J. Stoer for their guidance in the preparation of the dissertation, written at the Munchen Technischen Hochschule, upon which this paper is based.
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Gries, D. Characterizations of certain classes of norms. Numer. Math. 10, 30–41 (1967). https://doi.org/10.1007/BF02165157
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DOI: https://doi.org/10.1007/BF02165157