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Kwee, B. (1970) The hausdorff summability of fourier series. Proceedings of the American Mathematical Society, 24 (3). pp. 586-592. ISSN 0002-9939,
Kwee, B.W. (1968) The relation between the sequence-to-sequence and the series-to-series versions of quasi-Hausdorff summability methods. Proceedings of the American Mathematical Society, 19 (1). pp. 45-49. ISSN 0002-9939, DOI https://doi.org/10.1090/S0002-9939-1968-0218787-1.