@article{WorseckDaviesHennawietal.2019,
  author    = {Gabor Worseck and Frederick B. Davies and Joseph F. Hennawi and J. Xavier Prochaska},
  title     = {The Evolution of the He II-ionizing Background at Redshifts 2.3 < z < 3.8 Inferred from a Statistical Sample of 24 HST/COS He II Lyα Absorption Spectra},
  journal   = {The astrophysical journal : an international review of spectroscopy and astronomical physics},
  volume    = {875},
  number    = {2},
  doi       = {10.3847/1538-4357/ab0fa1},
  year      = {2019},
}