@article{Tarkhanov2011,
  author    = {Nikolai Nikolaevich Tarkhanov},
  title     = {The dirichlet to Neumann operator for elliptic complexes},
  journal   = {Transactions of the American Mathematical Society},
  volume    = {363},
  number    = {12},
  pages     = {6421 -- 6437},
  year      = {2011},
}