@book{SchulzeDemuthAlbeverioetal.2001,
  author    = {Schulze, Bert-Wolfgang and Demuth, Michael and Albeverio, Sergio and Schrohe, Elmar},
  title     = {Advances in Partial differential equations},
  publisher = {Birkh{\"a}user},
  address   = {Basel},
  year      = {2001},
  language  = {en}
}
@book{AlbeverioDemuthSchroheetal.2002,
  author    = {Albeverio, Sergio and Demuth, Michael and Schrohe, Elmar and Schulze, Bert-Wolfgang},
  title     = {Parabolicity, volterra calculus, and conical singularities : a volume of advances in partial differential equations},
  series = {Operator theory : advances and applications},
  volume    = {138},
  journal   = {Operator theory : advances and applications},
  publisher = {Birkh{\"a}user Verl.},
  address   = {Basel},
  isbn      = {3-7643-6906-x},
  pages     = {358 S.},
  year      = {2002},
  language  = {en}
}
@article{AlbeverioBrascheNeidhardt1998,
  author    = {Albeverio, Sergio and Brasche, Johannes F. and Neidhardt, Hagen},
  title     = {On inverse spectral theory: mixed types of spectra.},
  year      = {1998},
  language  = {en}
}