Bel’skii, D. V., and G. P. Pelyukh. “Asyptotic Bounds for the Solutions of Functional and differentialfunctional equations With Constant and Linear Delays”. Ukrains’kyi Matematychnyi Zhurnal 71, no. 9 (September 25, 2019): 1249-1270. Accessed April 26, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/1513.