A. V. Chaikovs'kyi, “On solutions defined on an axis for differential equations with shifts of the argument”, Ukr. Mat. Zhurn., vol. 63, no. 9, pp. 1290–1296, Sep. 2011, Accessed: Apr. 09, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2806