Karapınar, Erdal; Luong, Nguyen Van Quadruple fixed point theorems for nonlinear contractions. (English) Zbl 1268.54025 Comput. Math. Appl. 64, No. 6, 1839-1848 (2012). MSC: 54H25 54F05 54E40 PDFBibTeX XMLCite \textit{E. Karapınar} and \textit{N. Van Luong}, Comput. Math. Appl. 64, No. 6, 1839--1848 (2012; Zbl 1268.54025) Full Text: DOI
Karapınar, Erdal; Shatanawi, Wasfi; Mustafa, Zead Quadruple fixed point theorems under nonlinear contractive conditions in partially ordered metric spaces. (English) Zbl 1251.54050 J. Appl. Math. 2012, Article ID 951912, 17 p. (2012). MSC: 54H25 PDFBibTeX XMLCite \textit{E. Karapınar} et al., J. Appl. Math. 2012, Article ID 951912, 17 p. (2012; Zbl 1251.54050) Full Text: DOI