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To the memory of professor Leopold Fejér
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Joó, I. Almost everywhere divergent Fourier series with respect to arbitrary bounded orthonormal system of the form {ϕ(n k x)}. Acta Mathematica Academiae Scientiarum Hungaricae 37, 35–38 (1981). https://doi.org/10.1007/BF01904870
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DOI: https://doi.org/10.1007/BF01904870