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Sáfár Zoltán: Absolutely convergent double Fourier series and generalized multiplicative Lipschitz classes of functions. In: Acta scientiarum mathematicarum, (75) 3-4. pp. 617-633. (2009)
Brown Gavin; Móricz Ferenc; Sáfár Zoltán: Formal differentiation of absolutely convergent Fourier series and classical function classes. In: Acta scientiarum mathematicarum, (75) 1-2. pp. 161-173. (2009)