Horodets’kyi, V. V., O. V. Martynyuk, and R. I. Petryshyn. “Nonlocal Multipoint (in Time) problem for Evolutionary Pseudodifferential Equations With Analytic Symbols in Spaces of Type $W$”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 71, no. 9, Sept. 2019, pp. 1208-26, https://umj.imath.kiev.ua/index.php/umj/article/view/1510.