Ehigie, Julius, Festa Ndubuogaranya, Ridwan Atolagbe, Akudo Ijezie, and Solomon Okunuga. “A Class of One-Stage Two-Derivative Diagonally Implicit Runge-Kutta Methods for Sine-Gordon Equation”. International Journal of Mathematical Analysis and Modelling 9, no. 1 (August 9, 2026). Accessed August 23, 2026. http://tnsmb.org/journal/index.php/ijmam/article/view/292.