Abhulimen, C. N., M. M. Abdullah, and A. A. Amuno. “Eight-Order Implicit Block Method With Two Off-Step Points for Stiff Ordinary Differential Equations”. International Journal of Mathematical Sciences and Optimization: Theory and Applications, Vol. 11, no. 3, Aug. 2025, pp. 36 -48, https://ijmso.unilag.edu.ng/article/view/2901.