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To Professor P. Turán on his 60th birthday.
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Vértesi, P.O.H. On certain linear operators. VII. Acta Mathematica Academiae Scientiarum Hungaricae 25, 67–80 (1974). https://doi.org/10.1007/BF01901748
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DOI: https://doi.org/10.1007/BF01901748