TOPPING, David M. UHF Algebras are Singly Generated. Mathematica Scandinavica, Berkeley, CA, United States, v. 22, p. 224–226, 1968. DOI: 10.7146/math.scand.a-10886. Disponível em: https://journals.msp.org/mscand/article/view/2413. Acesso em: 25 jul. 2026.