OPREA, Anca Maria. “Coincidence Point and Fixed Point Theorems for Rational Contractions”. Studia Universitatis Babeș-Bolyai Mathematica 60, no. 1 (March 30, 2015): 99–107. Accessed February 5, 2025. https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/5680.