R. Anbuselvi, and K. Usha. β€œOn Ternary Quadratic Diophantine Equation $z^2=40x^2+y^2$”. International Journal of Mathematics And its Applications 5, no. 4 - F (December 30, 2017): 977–983. Accessed May 13, 2026. http://ijmaa.in/index.php/ijmaa/article/view/1362.