@unpublished{FedchenkoTarkhanov2014,
  author  = {Dmitry Fedchenko and Nikolai Nikolaevich Tarkhanov},
  title   = {An index formula for Toeplitz operators},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Preprints des Instituts f{\"u}r Mathematik der Universit{\"a}t Potsdam},
  number    = {3(2014)12},
  pages     = {24},
  year    = {2014},
}