1. Blackadar, B.: $$K$$-Theory for Operator Algebras, Second edition, Mathematical Sciences Research Institute Publications, vol. 5. Cambridge University Press, Cambridge (1998)
2. Blecher, D., Phillips, N.C.: $$L^{p}$$ operator algebras with approximate identities I. Pac. J. Math. 303(2), 401–457 (2019)
3. Brown, N.P., Ozawa, N.: $$C^*$$-Algebras and Finite-Dimensional Approximations, Graduate Studies in Mathematics, vol. 88. American Mathematical Society, Providence (2008)
4. Connes, A.: An analogue of the Thom isomorphism for crossed products of a $$C^{*}$$-algebra by an action of $$\mathbb{R} $$. Adv. Math. 39, 31–55 (1981)
5. Conway, J.B.: A Course in Functional Analysis, Graduate Texts in Mathematics, vol. 96. Springer, New York (1990)