@unpublished{GrudskyTarkhanov2012,
  author  = {Serguey Grudsky and Nikolai Nikolaevich Tarkhanov},
  title   = {Conformal reduction of boundary problems for harmonic functions in a plane domain with strong singularities on the boundary},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Preprints des Instituts f{\"u}r Mathematik der Universit{\"a}t Potsdam},
  number    = {1(2012)10},
  year    = {2012},
}