@unpublished{SchulzeNazaikinskiiSternin2008,
  author  = {Bert-Wolfgang Schulze and Vladimir Nazaikinskii and Boris Sternin},
  title   = {The index of quantized contact transformations on manifolds with conical singularities},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Preprint},
  number    = {(1998) 16},
  year    = {2008},
}