Baranetskij, Ya.O., P.I. Kalenyuk, M. I. Kopach, and A.V. Solomko. 2020. “The Nonlocal Multipoint Problem With Dirichlet-Type Conditions for an Ordinary Differential Equation of Even Order With Involution”. Matematychni Studii 54 (1), 64-78. https://doi.org/10.30970/ms.54.1.64-78.