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Stavropol'. Translated fromSibirskiî Matematicheskiî Zhurnal, Vol. 39, No. 3, pp. 617–624, May–June, 1998.
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Sizhuk, V.P. On functions with negative coefficients which are starlike and convex with respect ton-symmetric points. Sib Math J 39, 534–541 (1998). https://doi.org/10.1007/BF02673911
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DOI: https://doi.org/10.1007/BF02673911