Slyusarchuk, V. Yu. 2017. “Favard – Amerio Theory for Almost Periodic Functional-Differential equations without the Use of $H$-Classes of These Equations”. Ukrains’kyi Matematychnyi Zhurnal 69 (6), 788-802. https://umj.imath.kiev.ua/index.php/umj/article/view/1735.