VƯƠNG, C. . Polya, Irreducible Subsets and Separable Hulls. Mathematical Statistician and Engineering Applications, [S. l.], v. 70, n. 2, p. 65–72, 2021. DOI: 10.17762/msea.v70i2.14. Disponível em: https://www.philstat.org/index.php/MSEA/article/view/14. Acesso em: 25 apr. 2024.