Naraniengar, M. T. “On the Locus of Points at Which Opposite Sides of a Quadrilateral Subtend Equal or Supplementary Angles”. The Journal of the Indian Mathematical Society 3, no. 4 (August 1, 1911): 132–140. Accessed November 8, 2024. https://informaticsjournals.co.in/index.php/jims/article/view/17802.