SlyusarchukV. Y. “Almost Periodic Solutions of Nonlinear Equations That Are Not Necessarily Almost Periodic in Bochner’s Sense”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 67, no. 2, Feb. 2015, pp. 230-44, https://umj.imath.kiev.ua/index.php/umj/article/view/1976.