Barabash, G.M., and Ya.M. Kholyavka. “Approximation of Modulus, Periods and Values of Jacobi Elliptic Functions”. Carpathian Mathematical Publications 6, no. 2 (December 22, 2014): 191–195. Accessed November 24, 2024. https://vps.pnu.edu.ua/index.php/cmp/article/view/1350.