GROH, U.; KÜMMERER, B. Bibounded operators on W*-algebras. MATHEMATICA SCANDINAVICA, [S. l.], v. 50, p. 269–285, 1982. DOI: 10.7146/math.scand.a-11959. Disponível em: https://www.mscand.dk/article/view/11959. Acesso em: 29 apr. 2024.