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  1. From v e-semigroups to hypersemigroups

    Article • Discussiones Mathematicae - General Algebra and Applications, January 2021, Faculty of Mathematics, Computer Science and Econometrics, University of Zielona Gora

    Niovi Kehayopulu

  2. A characterization of regular, intra-regular, left quasi-regular and semisimple hypersemigroups in terms of fuzzy sets

    Article • Pure Mathematics and Applications, January 2017, De Gruyter

    Niovi Kehayopulu

  3. Characterization of the Set of Regular Elements in Ordered Semigroups

    Article • Mathematica Slovaca, January 2015, De Gruyter

    Niovi Kehayopulu

  4. Remark on quasi-ideals of ordered semigroups

    Article • Pure Mathematics and Applications, January 2015, De Gruyter

    Niovi Kehayopulu