@unpublished{KapanadzeSchulzeSeiler2009,
  author  = {D. Kapanadze and Bert-Wolfgang Schulze and J. Seiler},
  title   = {Operators with singular trace conditions on a manifold with edges},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Preprint},
  number    = {(2006) 01},
  year    = {2009},
}