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This research was completed while the author was a visiting professor at the Syracuse University, New York, U.S.A., in the academic year 1986/87.
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Móricz, F. On Λ-strong convergence of double numerical sequences and Fourier series. Acta Math Hung 56, 125–136 (1990). https://doi.org/10.1007/BF01903714
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DOI: https://doi.org/10.1007/BF01903714