@article{LangerFliegnerHegeretal.1997,
  author    = {Langer, Norbert and Fliegner, J. and Heger, Alexander and Woosley, S. E.},
  title     = {Nucleosynthesis in rotating massive stars},
  year      = {1997},
  language  = {en}
}
@article{LangerHeerFliegner1997,
  author    = {Langer, Norbert and Heer, A. and Fliegner, Jana Ute},
  title     = {Rotation : a fundamental parameter of massive stars},
  year      = {1997},
  language  = {en}
}
@article{Langer1997,
  author    = {Langer, Norbert},
  title     = {The Eddington limit in rotating massive stars},
  year      = {1997},
  language  = {en}
}
@article{HegerJeanninLangeretal.1997,
  author    = {Heger, Alexander and Jeannin, Laurent and Langer, Norbert and Baraffe, Isabelle},
  title     = {Pulsations in red supergiants with high L/M ratio : implications for the stellar and circumstellar structure of supernova progenitors},
  year      = {1997},
  language  = {en}
}
@article{OsterbartLangerWeigelt1997,
  author    = {Osterbart, R. and Langer, Norbert and Weigelt, G.},
  title     = {High-resolution imaging of the bipola Red Rectangle},
  year      = {1997},
  language  = {en}
}
@article{LangerHegerGarciaSegura1998,
  author    = {Langer, Norbert and Heger, Alexander and Garcia-Segura, Guillermo},
  title     = {Massive stars : the pre-supernova evolution of internal and circumstellar structure},
  year      = {1998},
  language  = {en}
}
@article{LangerBraunWellstein1998,
  author    = {Langer, Norbert and Braun, H. and Wellstein, Stephan},
  title     = {Massive close binaries as source of galatic 26Al},
  year      = {1998},
  language  = {en}
}
@article{FigerNajarroMorisetal.1998,
  author    = {Figer, Donald F. and Najarro, F. and Moris, Mark and Mclean, Ian S. and Geballe, T. R. and Ghez, A. M. and Langer, Norbert},
  title     = {The Pistol star},
  year      = {1998},
  language  = {en}
}
@article{GarciaSeguraLangerRozyczkaetal.1998,
  author    = {Garcia-Segura, Guillermo and Langer, Norbert and Rozyczka, M. and MacLow, Mordecai-Mark},
  title     = {The effects of rotation and stellar magnetic fields on the nebular shapes : LBV nebulae and PNe},
  year      = {1998},
  language  = {en}
}
@article{HegerLangerWoosley1998,
  author    = {Heger, Alexander and Langer, Norbert and Woosley, S. E.},
  title     = {Nucleosynthesis in rotating massive stars},
  year      = {1998},
  language  = {en}
}