SAMOILENKO, Yu. S.; RABANOVICH, V. I. On representations of $\mathcal F_n$-algebras and invertibility symbols. Methods of Functional Analysis and Topology, [S. l.], v. 4, n. 4, p. 86–96, 1998. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/77. Acesso em: 18 dec. 2025.