SARMA, Bhaba Kumar; SINHA, Kalyan. The nonnegative Q−matrix completion problem. Journal of Algebra Combinatorics Discrete Structures and Applications, [S. l.], v. 4, n. 1, p. 61–74, 2017. Disponível em: https://www.jacodesmath.com/index.php/jacodesmath/article/view/56. Acesso em: 19 aug. 2026.