@unpublished{HarutjunjanSchulze2008,
  author  = {Gohar Harutjunjan and Bert-Wolfgang Schulze},
  title   = {The Zaremba problem with singular interfaces as a corner boundary value problem},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Preprint},
  number    = {(2004) 26},
  year    = {2008},
}