@article{4717,
  author = {J. Parker},
  title = {Measuring the direct sky brightness on CCD images},
  year = {1991},
  journal = {Publications of the Astronomical Society of the Pacific},
  volume = {103},
  pages = {243},
  month = {Jan-08-1991},
  issn = {0004-6280},
  url = {http://articles.adsabs.harvard.edu/full/1991PASP..103..243P},
  doi = {10.1086/132812},
}