ENGLIS, Miroslav; PEETRE, Jaak. On the Correspondence Principle for the Quantized Annulus. MATHEMATICA SCANDINAVICA, [S. l.], v. 78, p. 183–206, 1996. DOI: 10.7146/math.scand.a-12582. Disponível em: https://tidsskrift.dk/math/article/view/12582. Acesso em: 14 aug. 2026.