Chandok S. and NarangT. D. (2010) “Common fixed points and invariant approximation of $R$-subweakly commuting maps in convex metric spaces”, Ukrains’kyi Matematychnyi Zhurnal, 62(10), pp. 1367–1376. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2961 (Accessed: 27July2024).