V. Y. Slyusarchuk, “Necessary and sufficient conditions for the invertibility of nonlinear differentiable maps”, Ukr. Mat. Zhurn., vol. 68, no. 4, pp. 563–576, Apr. 2016, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/1861