Vendrúscolo, D., and P. Wong. “Jiang-Type Theorems for Coincidences of Maps into Homogeneous Spaces”. Topological Methods in Nonlinear Analysis, vol. 31, no. 1, Mar. 2008, pp. 151-60, https://apcz.umk.pl/TMNA/article/view/TMNA.2008.008.