Xiguang Li,  Existence of Solution for Singular Two-point Boundary Value Problem of Second-order Differential Equation.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    February 2011, vol. 50(2). 121 - 123
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/3262.