WASET
    A. Benzian,  Einstein’s General Equation of the Gravitational Field.   journal   = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    October 2020, vol. 167(11). 121 - 126
    [viewed 18 September 2024]. Available from: https://publications.waset.org/pdf/10011565.