Hoa, Le Hoan, et al. “Topological Structure of Solution Set for a Class of Fractional Neutral Evolution Equations on the Half-Line”. Topological Methods in Nonlinear Analysis, vol. 48, no. 1, July 2016, pp. 235-5, https://apcz.umk.pl/TMNA/article/view/TMNA.2016.044.