Harjani, J.; López, B.; Sadarangani, K. Positive solutions for a fractional boundary value problem via a mixed monotone operator. (English) Zbl 07370670 Fixed Point Theory 22, No. 1, 189-204 (2021). MSC: 47H10 49L20 PDFBibTeX XMLCite \textit{J. Harjani} et al., Fixed Point Theory 22, No. 1, 189--204 (2021; Zbl 07370670) Full Text: Link
Harjani, J.; Sabetghadam, F.; Sadarangani, K. Fixed points for mappings of cyclical type in ordered metric spaces. (English) Zbl 1292.54024 Fixed Point Theory 14, No. 2, 369-378 (2013). MSC: 54H25 54F05 54E40 PDFBibTeX XMLCite \textit{J. Harjani} et al., Fixed Point Theory 14, No. 2, 369--378 (2013; Zbl 1292.54024) Full Text: Link
Harjani, J.; López, B.; Sadarangani, K. Fixed point theorems for cyclic \(\varphi \)-contractions in ordered metric spaces. (English) Zbl 1292.54023 Fixed Point Theory 14, No. 2, 359-368 (2013). MSC: 54H25 54E50 54F05 PDFBibTeX XMLCite \textit{J. Harjani} et al., Fixed Point Theory 14, No. 2, 359--368 (2013; Zbl 1292.54023) Full Text: Link