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This paper was written while the authors were members of the Summer Research Institute, Canadian Mathematical Congress, Kingston 1952.
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Lorentz, G.G., Macphail, M.S. Direct theorems on methods of summability III: absolute summability functions. Math Z 59, 231–246 (1953). https://doi.org/10.1007/BF01180254
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DOI: https://doi.org/10.1007/BF01180254