THOMSEN, K. On the embedding and diagonalization of matrices over $C(X)$. MATHEMATICA SCANDINAVICA, [S. l.], v. 60, p. 219–228, 1987. DOI: 10.7146/math.scand.a-12181. Disponível em: https://www.mscand.dk/article/view/12181. Acesso em: 5 may. 2024.