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Chee, P.S. (1970) On the generalized blaschke condition. Transactions of the American Mathematical Society, 152 (1). pp. 227-231. ISSN 0002-9947, DOI https://doi.org/10.1090/S0002-9947-1970-0268405-5.
Kwee, B. (1970) The hausdorff summability of fourier series. Proceedings of the American Mathematical Society, 24 (3). pp. 586-592. ISSN 0002-9939,