SANO, Yoshio. On the rank functions of $\mathcal{H}$-matroids. Journal of Algebra Combinatorics Discrete Structures and Applications, [S. l.], v. 3, n. 1, p. 7–11, 2016. Disponível em: https://www.jacodesmath.com/index.php/jacodesmath/article/view/25. Acesso em: 2 sep. 2026.