Afshari, Hojat, Shahram Rezapour, and Naseer Shahzad. “Absolute Retractivity of the Common Fixed Points Set of Two Multifunctions”. Topological Methods in Nonlinear Analysis 40, no. 2 (April 23, 2012): 429–436. Accessed March 28, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.2012.040.