Xin, J., C. Zhu, J. Wang, i F. Chen. „Nondecreasing Solutions of Fractional Quadratic Integral Equations Involving Erdélyi-Kober Singular Kernels”. Topological Methods in Nonlinear Analysis, t. 44, nr 1, kwiecień 2016, s. 73-88, https://apcz.umk.pl/TMNA/article/view/TMNA.2014.036.