KUCIA, Anna; NOWAK, Andrzej. On Carathéodory type selectors in a Hilbert space. Annales Mathematicae Silesianae, [S. l.], v. 2, p. 47–52, 1986. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/14320. Acesso em: 22 may. 2025.