@article{121001,
  author = {J Baldwin and G Ferland and P Martin and M Corbin and Agustin Cota and Ben Peterson and A Slettebak},
  title = {Physical conditions in the Orion Nebula and an assessment of its helium abundance},
  year = {1991},
  number = {374},
  month = {1991-01-01},
  publisher = {Astrophysical Journal},
  language = {en},
}