@article{Baumgaertel2001,
  author    = {Baumg{\"a}rtel, Hellmut},
  title     = {An Application of the DR-Duality Theory for Compact Groups to Endomorphism Categories of C*-Algebras with Nontrivial Center},
  year      = {2001},
  language  = {en}
}
@article{BaumgaertelCarey2001,
  author    = {Baumg{\"a}rtel, Hellmut and Carey, A.},
  title     = {Hilbert systems for actions of the circle group},
  year      = {2001},
  language  = {en}
}