Ahmet Tekcan and  Arzu Özkoç and  Canan Kocapınar and  Hatice Alkan,  The Pell Equation x2 − Py2 = Q.   journal   = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    July 2010, vol. 43(7). 795 - 798
    [viewed 21 April 2021]. Available from: https://publications.waset.org/pdf/7822.