Beliovskaya, L., Bogomolov, N. and Kovalev, A. (2000) “Construction of isoline maps of functions of two variables”, Numerical Methods and Programming (Vychislitel’nye Metody i Programmirovanie), 1(1), pp. 15–23. Available at: https://en.num-meth.ru/index.php/journal/article/view/10 (Accessed: 28 April 2024).