Zhengsheng Wang and  Jing Qi and  Chuntao Liu and  Yuanjun Li,  Weighted Harmonic Arnoldi Method for Large Interior Eigenproblems.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    August 2011, vol. 56(8). 1288 - 1291
    [viewed 26 January 2020]. Available from: https://publications.waset.org/pdf/2651.