Udo-utun, Xavier Alexius On retraction problem concerning inclusion of \(F\)-contractions in almost contractions. (English) Zbl 1449.54103 Afr. Mat. 30, No. 3-4, 643-650 (2019). MSC: 54H25 54E40 × Cite Format Result Cite Review PDF Full Text: DOI
Udo-utun, Xavier On inclusion of \(F\)-contractions in \((\delta, k)\)-weak contractions. (English) Zbl 1477.47053 Fixed Point Theory Appl. 2014, Paper No. 65, 6 p. (2014). MSC: 47H10 47H09 × Cite Format Result Cite Review PDF Full Text: DOI OA License
Udo-Utun, Xavier A generalization of Afuwape-Barbashin-Ezeilo problem for certain third-order nonlinear vibrations. (English) Zbl 1335.34077 J. Niger. Math. Soc. 33, 159-167 (2014). MSC: 34C25 45G10 45J05 45D05 × Cite Format Result Cite Review PDF
Udo-utun, Xavier Existence of strong coupled fixed points for cyclic coupled Ciric-type mappings. (English) Zbl 1329.54057 J. Oper. 2014, Article ID 381685, 4 p. (2014). Reviewer: Zoran Kadelburg (Beograd) MSC: 54H25 54E40 54E50 × Cite Format Result Cite Review PDF Full Text: DOI