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© 2022 Dariia A. Krasnytska, Olena O. Khita, Dariia O. Tsymbal, Olha Y. Luzina, Anastasiia A. Cherednychenko, Halyna E. Kozynkevich, Borys H. Bezrodny, Dmytro O. Minchenko, published by Slovak Academy of Sciences, Mathematical Institute
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