Hess, P. and Melo, S. T. (2009) “K-Theory of an Algebra of Pseudodifferential Operators on a Noncompact Manifold”, CUBO, A Mathematical Journal, 11(5), pp. 51–56. Available at: https://cubo.ufro.cl/index.php/cubo/article/view/1443 (Accessed: 12 October 2025).