S. Vidhyalakshmi, J.Shanthi, T. Mahalakshmi, M.A. Gopalan. “A Classification of Rectangles in Connection With Two Fascinating Number Patterns”. International Journal of Advanced Science and Technology, Vol. 29, no. 8s, Apr. 2020, pp. 1231 -35, http://sersc.org/journals/index.php/IJAST/article/view/11897.