Assanova, A. T., E. A. Bakirova, and Z. M. Kadirbayeva. “On the Unique Solvability of a nonlocal boundary-Value Problem for Systems of Loaded Hyperbolic Equations With impulsive actions”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 69, no. 8, Aug. 2017, pp. 1011-29, https://umj.imath.kiev.ua/index.php/umj/article/view/1755.