Pelyukh, G. P., and D. V. Bel’skii. “Asymptotic Behavior of Solutions of the Differential-Functional Equation With Linearly Transformed Argument”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 72, no. 1, Jan. 2020, pp. 69-85, https://umj.imath.kiev.ua/index.php/umj/article/view/773.