Horodets’kyi, V. V., O. V. Martynyuk, and R. I. Petryshyn. 2013. “Correct Solvability of a Nonlocal Multipoint (in Time) Problem for One Class of Evolutionary Equations”.
Ukrains’kyi Matematychnyi Zhurnal 65 (3): 339-53.
https://umj.imath.kiev.ua/index.php/umj/article/view/2423.