Mohammed, Khadijah, and M. M. Khader. 2016. “A Computational Solution of the Multi-Term Nonlinear ODEs With Variable Coefficients Using the Integral-Collocation-Approach Based on Legendre Polynomials”. Journal of Progressive Research in Mathematics 9 (3), 1406-10. http://scitecresearch.com/journals/index.php/jprm/article/view/857.