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This research was completed while the authors were visiting professors at the University of Tennessee, Knoxville, during the academic year 1987/88.
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Móricz, F., Schipp, F. On the integrability andL 1-convergence of double Walsh series. Acta Math Hung 57, 371–380 (1991). https://doi.org/10.1007/BF01903688
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DOI: https://doi.org/10.1007/BF01903688