Radchenko, O.Ya., Ternopil Volodymyr Hnatiuk National Pedagogical University, 2 Maxyma Kryvonosa Str., Ternopil, Ukraine
Rahman, Sh., Department of Mathematics, Maulana Azad National Urdu University Polytechnic Darbhanga (Centre), 846001, Bihar, India
Raievska, I.Yu., Institute of Mathematics, National Academy of Sciences of Ukraine, 3 Tereschenkivska str., 01024, Kyiv, Ukraine
Raievska, M.Yu., Institute of Mathematics, National Academy of Sciences of Ukraine, 3 Tereschenkivska str., 01024, Kyiv, Ukraine
Rakdi, M.A., Laboratory of Pures and Applied Mathematics, Department of Mathematics, Mohamed Boudiaf University of Msila, P.O. Box 166 Ichbilia, Msila 28000, Algeria
Ramírez, W., University of the Coast, Calle 58 # 55 - 66, Barranquilla, Colombia
Ramskyi, A., Khmelnytskyi National University, 11 Instytytska str., 29016, Khmelnytskyi, Ukraine
Randriamaro, H., Lot II B 32 bis Faravohitra, 101 Antananarivo, Madagascar
Rapita, V., Ivan Franko Lviv National University, 1 Universytetska str., 79000, Lviv, Ukraine
Rather, B.A., University of Kashmir, 190006, Srinagar, India
Ravsky, A., Pidstryhach Institute for Applied Problems of Mechanics and Mathematics, 3b Naukova str., 79060, Lviv, Ukraine
Ravsky, A.V., Institute for Applied Problems of Mechanics and Mathematics, 3b Naukova str., 79060, Lviv, Ukraine
Ravsky, A.V., Pidstryhach Institute for Applied Problems of Mechanics and Mathematics, 3b Naukova str., 79060, Lviv, Ukraine
Reddy, G.S.M., Faculty of Science and Technology, ICFAI Foundation for Higher Education, 501203, Hyderabad, India
Repetylo, S.M., Lviv Polytechnic National University, 12 Bandera str., 79013, Lviv, Ukraine; Pidstryhach Institute for Applied Problems of Mechanics and Mathematics, 3b Naukova str., 79060, Lviv, Ukraine
Rihane, S.E., Institute of Science and Technology, University Center of Mila, Mila, Algeria
Romaniv, A.M., Pidstryhach Institute for Applied Problems of Mechanics and Mathematics, 3b Naukova str., 79060, Lviv, Ukraine
Romaniv, O.M., Ivan Franko Lviv National University, 1 Universytetska str., 79000, Lviv, Ukraine
Romanyuk, A.S., Institute of Mathematics, National Academy of Sciences of Ukraine, 3 Tereschenkivska str., 01024, Kyiv, Ukraine
Romanyuk, V.S., Institute of Mathematics, National Academy of Sciences of Ukraine, 3 Tereschenkivska str., 01024, Kyiv, Ukraine
Rovenska, O.G., Slavyansk State Pedagogical University, 19 Batiuka str., 84116, Slavyansk, Ukraine
Roy, B., Women’s Christian College, 700026, Kolkata, India
Roy, S., Department of Mathematics, Jadavpur University, Kolkata, India

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