Mohammed, K., and M. M. Khader. “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, Vol. 9, no. 3, Oct. 2016, pp. 1406-10, http://scitecresearch.com/journals/index.php/jprm/article/view/857.