Shawagfeh, N. T. y Glasser, M. L. (2011) «Uniform asymptotic solutions of second order linear differential equations with double pole and turning point», Rev. Téc. Fac. Ing. Univ. Zulia, 13(1). Disponible en: https://mail.produccioncientificaluz.org/index.php/tecnica/article/view/5354 (Accedido: 12junio2025).