Nikodem, Kazimierz, Elżbieta Sadowska, and Szymon Wąsowicz. “A Note on Separation by Subadditive and Sublinear Functions”. Annales Mathematicae Silesianae 14 (July 23, 2022): 33–39. Accessed May 8, 2025. https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14125.