Bonotto, E. M., L. P. Gimenes, and G. M. Souto. “Asymptotically Almost Periodic Motions in Impulsive Semidynamical Systems”. Topological Methods in Nonlinear Analysis, vol. 49, no. 1, Oct. 2016, pp. 133-6, https://apcz.umk.pl/TMNA/article/view/TMNA.2016.065.