Xian Ming Gu and  Ting Zhu Huang and  Hou Biao Li,  Some Preconditioners for Block Pentadiagonal Linear Systems Based on New Approximate Factorization Methods.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    September 2013, vol. 76(4). 747 - 754
    [viewed 28 March 2020]. Available from: https://publications.waset.org/pdf/17064.