Bihun, Yaroslav, Roman Petryshyn, Ihor Skutar, and Halyna Melhyk. 2022. “Multifrequency System With Multipoint and Integral Conditions”. Acta Et Commentationes Exact and Natural Sciences 12 (2), 19-32. https://doi.org/10.36120/2587-3644.v12i2.19-32.