@article{9219,
  author = {Roy Garstang},
  title = {Night-sky brightness at observatories and sites},
  year = {1989},
  journal = {Publications of the Astronomical Society of the Pacific},
  volume = {101},
  pages = {306},
  month = {Jan-02-1989},
  issn = {0004-6280},
  url = {http://articles.adsabs.harvard.edu/full/1989PASP..101..306G},
  doi = {10.1086/132436},
}