KLEEFELD, Frieder. Complex Covariance. Acta Polytechnica, [S. l.], v. 53, n. 3, 2013. DOI: 10.14311/1809. Disponível em: https://ojst.is.cvut.cz/ojs/index.php/ap/article/view/1809.. Acesso em: 12 may. 2025.