Gopalan, M., Kavitha, A. and Mary, A. (2017) β€œON THE POSITIVE PELL EQUATION y^2 = 72x^2 + 36”, International Journal of Research -GRANTHAALAYAH, 5(7(SE), pp. 68–74. doi: 10.29121/granthaalayah.v5.i7(SE).2017.2126.