ENGLIS, Miroslav; PEETRE, Jaak. On the Correspondence Principle for the Quantized Annulus. Mathematica Scandinavica, Berkeley, CA, United States, v. 78, p. 183–206, 1996. DOI: 10.7146/math.scand.a-12582. Disponível em: https://journals.msp.org/mscand/article/view/1049. Acesso em: 24 jul. 2026.