Gopalan, M. A., G. Sumathi, and S. Vidhyalakshmi. “On Special Families of Hyperbola ”,. The International Journal of Science & Technoledge 2, no. 3 (March 31, 2014). Accessed July 7, 2024. http://internationaljournalcorner.com/index.php/theijst/article/view/138563.