Y. Y. Trohimchuk, “Jacobian and the Darboux Property”, Ukr. Mat. Zhurn., vol. 67, no. 10, pp. 1439–1440, Oct. 2015, Accessed: Feb. 16, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2079