Li Xiguang,  Positive Solutions for Systems of Nonlinear Third-Order Differential Equations with p-Laplacian.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    August 2018, vol. 141(9). 184 - 189
    [viewed 24 January 2022]. Available from: https://publications.waset.org/pdf/10009479.