1. B. Blackadar, K-theory for Operator Algebras. Springer-Verlag, New York et al. 1986.
2. A. Connes, Noncommutative Differential geometry. Publ. Math. I.H.E.S 62 (1985), 257–360.
3. A. Connes, Noncommutative Geometry. Academic Press, NY, 1994.
4. C. Dorschfeldt, B.-W. Schulze, Pseudo-differential operators with operator-valued symbols in the Mellin-edge-approach. Ann. Global Anal. Geom. 12 (1994), 135–171.
5. B. Fedosov, Analytic formulas for the index of elliptic operators. Trans. Moscow Math. Soc. 30 (1974), 159–240.