Tunç, Osman, and E. Korkmaz. “New Results on the Qualitative Analysis of Solutions of VIDEs by the Lyapunov–Razumikhin Technique”. Ukrains’kyi Matematychnyi Zhurnal 74, no. 11 (December 26, 2022): 1544 - 1557. Accessed May 10, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/6083.