Li Xiguang,  Positive Solutions for Three-Point Boundary Value Problems of Third-Order Nonlinear Singular Differential Equations in Banach Space.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    September 2013, vol. 77(5). 919 - 922
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/17071.