@article{HenkelChinLangeretal.1999,
  author    = {Henkel, Carsten and Chin, Y. and Langer, Norbert and Mauersberger, R.},
  title     = {Detection of extragalactic 15N : Nitrogen nucleosynthesis and chemical evolution},
  year      = {1999},
  language  = {en}
}
@article{ChinHenkelLangeretal.1999,
  author    = {Chin, Y. and Henkel, Carsten and Langer, Norbert and Mauersberger, R.},
  title     = {The detection of extragalactic 15N : consequences for nitrogeen nucleosynthesis and chemical evolution},
  year      = {1999},
  language  = {en}
}