@book{Baumgaertel1994,
  author    = {Baumg{\"a}rtel, Hellmut},
  title     = {A modified approach to the Doplicher-Roberts theorem on the construction of field algebra and the symmetry group in superselection theory},
  series = {Preprint / SFB 288, Differentialgeometrie und Quantenphysik},
  volume    = {134},
  journal   = {Preprint / SFB 288, Differentialgeometrie und Quantenphysik},
  address   = {Berlin},
  pages     = {33 S.},
  year      = {1994},
  language  = {en}
}
@book{BaumgaertelJurkeLledo1994,
  author    = {Baumg{\"a}rtel, Hellmut and Jurke, Matthias and Lled{\´o}, Fernando},
  title     = {A remark on covariant and causal nets of CAR-resp.CCR-type local algebras assigned to the irreducible unitary representation of the poincare group labeled by (m>0, s, +)},
  series = {Preprint / SFB 288, Differentialgeometrie und Quantenphysik},
  volume    = {120},
  journal   = {Preprint / SFB 288, Differentialgeometrie und Quantenphysik},
  address   = {Berlin},
  year      = {1994},
  language  = {en}
}
@book{Baumgaertel1999,
  author    = {Baumg{\"a}rtel, Hellmut},
  title     = {Actions of finite abelian groups on abelian C*-algebras Z: Second cohomology and description by C*-extensions F ) Z},
  series = {Preprint / SFB 288, Differentialgeometrie und Quantenphysik},
  volume    = {383},
  journal   = {Preprint / SFB 288, Differentialgeometrie und Quantenphysik},
  address   = {Berlin},
  year      = {1999},
  language  = {en}
}
@book{Baumgaertel1999,
  author    = {Baumg{\"a}rtel, Hellmut},
  title     = {Cuntz algebras and superselection structures in Quantum Field Theory},
  series = {LQP Papers / Local Quantum Physics Crossroads},
  journal   = {LQP Papers / Local Quantum Physics Crossroads},
  publisher = {Univ.},
  address   = {G{\"o}ttingen},
  year      = {1999},
  language  = {en}
}
@book{BaumgaertelLledo2000,
  author    = {Baumg{\"a}rtel, Hellmut and Lled{\´o}, Fernando},
  title     = {Dual group actions on C*-algebras and their description by Hilbert extensions},
  series = {Preprint / SFB 288, Differentialgeometrie und Quantenphysik},
  volume    = {445},
  journal   = {Preprint / SFB 288, Differentialgeometrie und Quantenphysik},
  publisher = {Techn. Univ.},
  address   = {Berlin},
  pages     = {14 S.},
  year      = {2000},
  language  = {en}
}
@book{Baumgaertel1999,
  author    = {Baumg{\"a}rtel, Hellmut},
  title     = {Group actions on C*-algebras and their description by Hilbert C*-extensions},
  series = {Preprint / SFB 288, Differentialgeometrie und Quantenphysik},
  volume    = {385},
  journal   = {Preprint / SFB 288, Differentialgeometrie und Quantenphysik},
  address   = {Berlin},
  year      = {1999},
  language  = {en}
}
@book{BaumgaertelCarey2000,
  author    = {Baumg{\"a}rtel, Hellmut and Carey, A.},
  title     = {Hilbert systems for actions of the circle group},
  series = {ESI-Preprint / Erwin-Schr{\"o}der-Institut f{\"u}r Mathematische Physik, Wien},
  volume    = {940, 2000},
  journal   = {ESI-Preprint / Erwin-Schr{\"o}der-Institut f{\"u}r Mathematische Physik, Wien},
  publisher = {Erwin-Schr{\"o}der-Institut f{\"u}r Mathematische Physik},
  address   = {Wien},
  pages     = {14 S.},
  year      = {2000},
  language  = {en}
}
@book{Baumgaertel1995,
  author    = {Baumg{\"a}rtel, Hellmut},
  title     = {Operatoralgebraic methods in quantum field theory : a series of lectures},
  publisher = {Akademie Verl.},
  address   = {Berlin},
  pages     = {228 S.},
  year      = {1995},
  language  = {en}
}
@book{Baumgaertel1993,
  author    = {Baumg{\"a}rtel, Hellmut},
  title     = {Some operatoralgebraic fundamentals of the algebraic quantum field theory},
  series = {Preprint / Universit{\"a}t Potsdam, Fachbereich Mathematik},
  volume    = {1993, 09},
  journal   = {Preprint / Universit{\"a}t Potsdam, Fachbereich Mathematik},
  publisher = {Univ.},
  address   = {Potsdam},
  pages     = {43 Bl.},
  year      = {1993},
  language  = {en}
}
@book{BaumgaertelJurkeLledo1999,
  author    = {Baumg{\"a}rtel, Hellmut and Jurke, Matthias and Lled{\´o}, Fernando},
  title     = {Twisted duality for the CAR-algebra},
  series = {Preprint / SFB 288, Differentialgeometrie und Quantenphysik},
  volume    = {401},
  journal   = {Preprint / SFB 288, Differentialgeometrie und Quantenphysik},
  publisher = {Techn. Univ.},
  address   = {Berlin},
  year      = {1999},
  language  = {en}
}