Raievska, I., Department of Algebra and Topology, Institute of mathematics of NAS of Ukraine, Kyiv, Ukraine
Raievska, M., Department of Algebra and Topology, Institute of mathematics of NAS of Ukraine, Kyiv, Ukraine
Ratushniak, S., Institute of Mathematics of NASU
Romaniv, A., Pidstryhach Institute for Applied Problems of Mechanics and Mathematics NAS of Ukraine, Lviv, Ukraine
Romaniv, O., Department of Mechanics and Mathematics, Ivan Franko National University of Lviv, Lviv, Ukraine
Rotari, T., Department of Mathematics and Informatics, University of City „Alecu Russo", Balti, Moldova

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