Arti Vaish and  Harish Parthasarathy,  Method of Moments Applied to a Cuboidal Cavity Resonator: Effect of Gravitational Field Produced by a Black Hole.   journal   = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    August 2010, vol. 44(8). 1139 - 1143
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/15877.