1.
Kadets VМ, Popov ММ. The Lyapunov theorem on convexity and its use for sign-embeddings . Ukr. Mat. Zhurn. [Internet]. 1992Oct.7 [cited 2024Jul.27];44(9):1192-200. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/8169