Bihun, Y., Petryshyn, R., Skutar , I. and Melhyk , H. 2022. Multifrequency system with multipoint and integral conditions. Acta et Commentationes Exact and Natural Sciences. 12, 2 (Feb. 2022), 19-32. DOI:https://doi.org/10.36120/2587-3644.v12i2.19-32.