@article{LangerHeger1998,
  author    = {Langer, Norbert and Heger, Alexander},
  title     = {B[e] supergiants : what is their evolutionary status?},
  year      = {1998},
  language  = {en}
}
@article{LangerHeger1999,
  author    = {Langer, Norbert and Heger, Alexander},
  title     = {Evolution and explosion of Wolf-Rayet stars},
  year      = {1999},
  language  = {en}
}
@article{LangerHeger1999,
  author    = {Langer, Norbert and Heger, Alexander},
  title     = {Massive star evolution},
  year      = {1999},
  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{LangerHegerWellensteinetal.1999,
  author    = {Langer, Norbert and Heger, Alexander and Wellenstein, Stephan and Herwig, Falk},
  title     = {Mixing and nucleosynthesis in rotating TP-AGB stars},
  year      = {1999},
  language  = {en}
}
@article{LangerHegerBraun1998,
  author    = {Langer, Norbert and Heger, Alexander and Braun, H.},
  title     = {Nucleosynthesis in massive stars},
  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}
}
@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{HegerLangerWoosley2000,
  author    = {Heger, Alexander and Langer, Norbert and Woosley, S. E.},
  title     = {Presupernova evolution of rotating massive stars I : numerical method and evolution of the internal stellar structure},
  year      = {2000},
  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}
}