Choudhry, Ram Kishore. “On Periodic Orbits in the Restricted Problem of Three Bodies in a Three Dimensional Coordinate System”. The Journal of the Indian Mathematical Society 38, no. 1-4 (December 1, 1974): 319–328. Accessed July 18, 2024. https://informaticsjournals.com/index.php/jims/article/view/16706.