TUROWSKA, L. B.; MAZORCHUK, V. Existence and unicity of $\sigma$-forms on finite-dimensional modules. Methods of Functional Analysis and Topology, [S. l.], v. 7, n. 1, p. 53–62, 2001. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/139. Acesso em: 17 dec. 2025.