Jing Meng and  Peiyong Zhu and  Houbiao Li,  Global GMRES with Deflated Restarting for Families of Shifted Linear Systems.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    November 2014, vol. 93(9). 1264 - 1269
    [viewed 22 February 2020]. Available from: https://publications.waset.org/pdf/10000044.