Abhulimen, C. E., and L. A. Ukpebor. “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, Vol. 2018, Sept. 2018, pp. 382 -91, http://ijmso.unilag.edu.ng/article/view/55.