[1]
“Preserving of one-sided invariance in $\mathbb{R}^n$ with respect to systems of ordinary differential equations”, НК, vol. 5, no. 2, pp. 278–285, Jun. 2002, Accessed: Apr. 12, 2026. [Online]. Available: https://nosc.imath.kiev.ua/index.php/nosc/article/view/220