Horodets’kyiV. V., MartynyukO. V., and PetryshynR. I. “Correct Solvability of a Nonlocal Multipoint (in Time) Problem for One Class of Evolutionary Equations”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 65, no. 3, Mar. 2013, pp. 339-53, https://umj.imath.kiev.ua/index.php/umj/article/view/2423.