@article{9592,
  author = {A. Dalgarno and Richard McCray},
  title = {Heating and Ionization of HI Regions},
  year = {1972},
  journal = {Annual Review of Astronomy and Astrophysics},
  volume = {10},
  pages = {375-426},
  month = {Jan-09-1972},
  issn = {0066-4146},
  doi = {10.1146/annurev.aa.10.090172.002111},
}