Martynyuk, A. A., & Martynyuk-Chernienko, Y. A. (2013). Existence, uniqueness, and estimation of solutions for a set of equations of perturbed motion. Ukrains’kyi Matematychnyi Zhurnal, 65(2), 273-295. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/2418