SANDBERG, S. On non-holomorphic functional calculus for commuting operators. MATHEMATICA SCANDINAVICA, [S. l.], v. 93, n. 1, p. 109–135, 2003. DOI: 10.7146/math.scand.a-14416. Disponível em: https://www.mscand.dk/article/view/14416. Acesso em: 2 may. 2024.