@article{Gupta:2010WO,
  author = "Gupta, Neeraj  and  Srianand, R.  and  Saikia, D. J.  and  Noterdaeme, P.  and  Petitjean, P.",
  title = "{21cm absorbers at low and intermediate redshifts}",
  doi = "10.22323/1.089.0012",
  journal = "PoS",
  year = 2010,
  volume = "PRA2009",
  pages = "012"
}