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    • Khalladi, M. T.; Kostic, M.; Pinto Jiménez, Manuel Abelardo; Rahmani, A.; Velinov, D. (Hindawi, 2021)
      The main aim of this paper is to indicate that the notion of semi-c-periodicity is equivalent with the notion of c-periodicity, provided that c is a nonzero complex number whose absolute value is not equal to 1.