Anil Kumar and  C. Nagaraja Kumar,  Information Entropy of Isospectral Hydrogen Atom.   journal   = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    October 2011, vol. 58(10). 1650 - 1654
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/149.