YAKYMENKO, D. Yu. Decomposition of a unitary scalar operator into a product of roots of the identity. Methods of Functional Analysis and Topology, [S. l.], v. 19, n. 2, p. 191–196, 2013. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/546. Acesso em: 16 dec. 2025.