PETRUŞEL, Adrian, PETRUŞEL, Gabriela and YAO, Jen-Chih. New fixed point results for nonlinear Feng-Liu contractions with applications. Topological Methods in Nonlinear Analysis. Online. 3 March 2024. Vol. 63, no. 1, pp. 153 - 166. [Accessed 29 June 2025]. DOI 10.12775/TMNA.2023.030.