Indrakumar, S., and K. Kanagarajan. “Runge-Kutta Method of Order Four for Solving Fuzzy Delay Differential Equations under Generalized Differentiability”. Journal of Applied Nonlinear Dynamics, vol. 7, no. 2, Aug. 2026, pp. 131-46, https://doi.org/10.5890/JAND.2018.06.003.