FAHRENWALDT, M. A. Complex powers of abstract pseudodifferential operators. Methods of Functional Analysis and Topology, [S. l.], v. 24, n. 4, p. 305–338, 2018. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/703. Acesso em: 13 dec. 2025.