@unpublished{ShlapunovTarkhanov2013,
  author  = {Alexander Shlapunov and Nikolai Nikolaevich Tarkhanov},
  title   = {Sturm-Liouville problems in domains with non-smooth edges},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Preprints des Instituts f{\"u}r Mathematik der Universit{\"a}t Potsdam},
  number    = {2(2013)13},
  year    = {2013},
}