- Anton Savin, “Elliptic Operators on Manifolds with Singularities and K-Homology”, K-Theory, 34, № 1, 2005,
71 
- V. E. Nazaikinskii, A. Yu. Savin, B. Yu. Sternin, “Noncommutative geometry and classification of elliptic operators”, J Math Sci, 164, № 4, 2010,
603