[1]
V. V. Sharko, “About Kronrod-Reeb graph of a function on a manifold”, MFAT, vol. 12, no. 4, pp. 389–396, Dec. 2006, Accessed: Dec. 16, 2025. [Online]. Available: https://zen.imath.kiev.ua/index.php/mfat/article/view/331