Mitropolskiy, Y.A. and Sokil, B.I. (1998) “On the application of Ateb-functions to the construction of an asymptotic solution of the perturbed nonlinear Klein-Gordon equation”, Ukrains’kyi Matematychnyi Zhurnal, 50(5), pp. 665–670. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4904 (Accessed: 5 December 2025).