Petruşel, Adrian, Ioan A. Rus, and Marcel-Adrain Şerban. “The Role of Equivalent Metrics in Fixed Point Theory”. Topological Methods in Nonlinear Analysis 41, no. 1 (April 22, 2013): 85–112. Accessed January 21, 2026. https://apcz.umk.pl/TMNA/article/view/TMNA.2013.004.