by Dovgoshey, O.A., Prestin, J., Shevchuk, I.O.
Published in Dopovidi Nacionalʹnoï akademiï nauk Ukraïni (09.03.2023)

by Leviatan, D., Shchehlov, M.V., Shevchuk, I.O.
Published in Journal of approximation theory (01.05.2024)

by Halan, V.D, Shevchuk, I.O
Published in Ukrainian mathematical journal (01.10.2017)

by Lukovs'kyi, I.O, Makarov, V.L, Tymokha, O.M, Motornyi, V.P, Shevchuk, I.O, Holub, A.P, Zaderei, P.V, Romanyuk, A.S, Savchuk, V.V, Serdyuk, A.S, Sokolenko, I.V, Shydlich, A.L
Published in Ukrainian mathematical journal (01.10.2022)

by Samoilenko, A.M, Zadiraka, V.K, Letychevs'kyi, O.A, Lukovs'kyi, I.O. Lukovs, Makarov, V.L, Holub, A.P, Dzyadyk, Yu.V, Kovtunets', V.V, Romanyuk, A.S, Serdyuk, A.S, Shevchuk, I.O
Published in Ukrainian mathematical journal (01.07.2019)