@article{BrascheNeidhardt1995,
  author    = {Brasche, Johannes F. and Neidhardt, Hagen},
  title     = {On the point spectrum of selfadjoint extensions},
  year      = {1995},
  language  = {en}
}
@article{BrascheNeidhardt1995,
  author    = {Brasche, Johannes F. and Neidhardt, Hagen},
  title     = {On the absolutely continuous spectrum of self-adjoint extensions},
  year      = {1995},
  language  = {en}
}