Jingbo Yang and  Hong Li and  Yang Liu and  Siriguleng He,  A Nonconforming Mixed Finite Element Method for Semilinear Pseudo-Hyperbolic Partial Integro-Differential Equations.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    August 2012, vol. 68(8). 886 - 893
    [viewed 25 January 2022]. Available from: https://publications.waset.org/pdf/10420.