@article{1615,
  author = {Küpcü Yolda and J. Greiner and Rosalba Perna},
  title = {Constraining the environment of GRB 990712  through emission line fluxes},
  year = {2006},
  journal = {Astronomy and Astrophysics},
  volume = {457},
  pages = {115-119},
  month = {Jan-10-2006},
  issn = {0004-6361},
  doi = {10.1051/0004-6361:20065672},
}