Lagoda VA, Parasyuk IO. Theorem on the existence of an invariant section over $\mathbb{R}^m$ for the indefinite monotone system in $\mathbb{R}^m \times \mathbb{R}^n$. Ukr. Mat. Zhurn. [Internet]. 2013Jan.25 [cited 2024Nov.22];65(1):103-18. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/2407