Henríquez, H. R., C. Lizama, and J. G. Mesquita. “Semigroups on Time Scales and Applications to Abstract Cauchy Problems”. Topological Methods in Nonlinear Analysis, vol. 56, no. 1, June 2020, pp. 83-115, https://apcz.umk.pl/TMNA/article/view/TMNA.2019.114.