@unpublished{KapanadzeSchulze2008,
  author  = {David Kapanadze and Bert-Wolfgang Schulze},
  title   = {Symbolic calculus for boundary value problems on manifolds with edges},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Preprint},
  number    = {(2001) 21},
  year    = {2008},
}