A collocation approximation of singularly perturbed second order ordinary differential equation. - O. A. Taiwo; P. Onumanyi (Int. J. Comput. Math., 1991)

Continuous finite difference approximations for solving differential equations. - P. Onumanyi; U. W. Sirisena; Samuel N. Jator (Int. J. Comput. Math., 1999)

A posteriori error estimator for Lanczos-Chebyshev reduction method. - Mathew R. Odekunle; Matthew A. Ibiejugba; P. Onumanyi (Appl. Math. Comput., 2003)