Serifenur Cebesoy and  Yelda Aygar and  Elgiz Bairamov,  Matrix Valued Difference Equations with Spectral Singularities.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    September 2015, vol. 107(11). 658 - 661
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/10002700.