@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 : 4 obstructions to elliptic problems on manifolds with edges},
  year      = {2002},
}