Bisht, Ravindra K., and Stojan Radenović. “Fixed Point Results for Four-Point Kannan Mappings With Applications to Fractional BVPs and Diophantine Equations”. Nonlinear Analysis: Modelling and Control, vol. 31, no. 5, July 2026, pp. 981–1002, https://doi.org/10.15388/namc.2026.31.47654.