@book{NazajkinskijSavinSchulzeetal.2002,
  author    = {Vladimir E. Nazajkinskij and Anton Savin and Bert-Wolfgang Schulze and Boris Sternin},
  title     = {Elliptic theory on Manifolds with nonisolated singularities : 3 the Spectral flow of Families of conaormal symbols},
  year      = {2002},
}