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We would like to thank the Turkish Scientific and Technical Research Council for partial support, and Prof. Dr. T. Terzioğlu for suggesting the problem and useful comments, and Prof. Dr. V. P. Zahariuta of drawing our attention to Fishman's result [5].
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Yurdakul, M. A remark on a paper of J. Prada. Arch. Math 61, 385–390 (1993). https://doi.org/10.1007/BF01201455
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DOI: https://doi.org/10.1007/BF01201455