@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{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}
}