BERTOT, Yves; ALLAIS, Guillaume. Views of PI: Definition and computation. Journal of Formalized Reasoning, [S. l.], v. 7, n. 1, p. 105–129, 2014. DOI: 10.6092/issn.1972-5787/4343. Disponível em: https://jfr.unibo.it/article/view/4343. Acesso em: 21 nov. 2024.