Shawagfeh, N. T., & Glasser, M. L. (2011). Uniform asymptotic solutions of second order linear differential equations with double pole and turning point. Revista Técnica Da Faculdade De Engenharia Da De Zulia, 13(1). Obtido de http://www.produccioncientifica.luz.edu.ve/index.php/tecnica/article/view/5354