@unpublished{RaskopGrothaus2005,
  author  = {Thomas Raskop and Martin Grothaus},
  title   = {On the oblique boundary problem with a stochastic inhomogeneity},
  institution = {Fachbereich Mathematik},
  series    = {Schriften zur Funktionalanalysis und Geomathematik},
  number    = {25},
  year    = {2005}
}