@article{WorseckKhrykinHennawietal.2021,
  author    = {G{\´a}bor Worseck and Ilya Sergeevich Khrykin and Joseph F. Hennawi and J. Xavier Prochaska and Emanuele Paolo Farina},
  title     = {Dating individual quasars with the He II proximity effect},
  journal   = {Monthly notices of the Royal Astronomical Society},
  volume    = {505},
  number    = {4},
  pages     = {5084 -- 5103},
  doi       = {10.1093/mnras/stab1685},
  year      = {2021},
}