@unpublished{HarutjunjanSchulze2008,
  author  = {G. Harutjunjan and Bert-Wolfgang Schulze},
  title   = {Reduction of orders in boundary value problems without the transmission property},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Preprint},
  number    = {(2002) 03},
  year    = {2008},
}