Nikodem, Kazimierz, Elżbieta Sadowska, and Szymon Wąsowicz. 2022. “A Note on Separation by Subadditive and Sublinear Functions”. Annales Mathematicae Silesianae 14 (July):33-39. https://journals.us.edu.pl/index.php/AMSIL/article/view/14125.