Abhulimen, C. E., and L. A. Ukpebor. 2018. “A New Class of Third Derivative Fourth-Step Exponential Fitting Numerical Integrator for Stiff Differential Equations”. International Journal of Mathematical Sciences and Optimization: Theory and Applications 2018 (September), 382 -91. http://ijmso.unilag.edu.ng/article/view/55.