NICHOLS, R.; GESZTESY, F. Some applications of almost analytic extensions to operator bounds in trace ideals. Methods of Functional Analysis and Topology, [S. l.], v. 21, n. 2, p. 151–169, 2015. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/608. Acesso em: 16 dec. 2025.