Caballero, Josefa, et al. “Existence of Solutions for a Fractional Hybrid Boundary Value Problem via Measures of Noncompactness in Banach Algebras”. Topological Methods in Nonlinear Analysis, vol. 43, no. 2, Apr. 2016, pp. 535-48, https://apcz.umk.pl/TMNA/article/view/TMNA.2014.031.