Assanova, A. T., and A. B. Tleulessova. “Nonlocal Problem for а System of Partial Differential Equations of Higher Order With Pulsed Actions”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 71, no. 12, Dec. 2019, pp. 1587-06, https://umj.imath.kiev.ua/index.php/umj/article/view/712.