TSEKANOVSKII, E.; MAKAROV, K. A. On $\mu$-scale invariant operators. Methods of Functional Analysis and Topology, [S. l.], v. 13, n. 2, p. 181–186, 2007. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/347. Acesso em: 16 dec. 2025.