SZTABA, Urszula. The Borel formula for integrable distributions. Annales Mathematicae Silesianae, [S. l.], v. 11, p. 33–37, 1997. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/14182. Acesso em: 5 dec. 2025.