On the Homotopy Classification of Elliptic Operators on Manifolds with   Edges
  We obtain a classification of elliptic operators modulo stable homotopy on manifolds with edges (this is in some sense the simplest class of manifolds with nonisolated singularities). We show that the operators are classified by the K-homology group of the manifold. To this end, we construct exact sequence in elliptic theory isomorphic to the K-homology exact sequence. The main part of the proof is the computation of the boundary map using semiclassical quantization. 
V. Nazaikinskii, A. Savin, B.-W. Schulze and B. Sternin