@article{FedosovSchulze1996,
  author    = {Fedosov, Boris V. and Schulze, Bert-Wolfgang},
  title     = {On the index elliptic operators on a cone},
  year      = {1996},
  language  = {en}
}
@article{FedosovSchulzeTarchanov1998,
  author    = {Fedosov, Boris V. and Schulze, Bert-Wolfgang and Tarchanov, Nikolaj N.},
  title     = {On the index of elliptice operators on a wedge},
  year      = {1998},
  language  = {en}
}
@article{FedosovSchulzeTarchanov1999,
  author    = {Fedosov, Boris V. and Schulze, Bert-Wolfgang and Tarchanov, Nikolaj N.},
  title     = {On the index formula for singular surfaces},
  year      = {1999},
  language  = {en}
}
@article{FedosovSchulzeTarchanov1999,
  author    = {Fedosov, Boris V. and Schulze, Bert-Wolfgang and Tarchanov, Nikolaj N.},
  title     = {The index of elliptic operators on manifolds with conical points},
  year      = {1999},
  language  = {en}
}