@unpublished{PolkovnikovTarkhanov2017,
  author  = {Alexander Polkovnikov and Nikolai Nikolaevich Tarkhanov},
  title   = {A Riemann-Hilbert problem for the Moisil-Teodorescu system},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Preprints des Instituts f{\"u}r Mathematik der Universit{\"a}t Potsdam},
  number    = {6 (2017) 3},
  pages     = {31},
  year    = {2017},
}