@article{4850,
  author = {Roy Garstang},
  title = {AG Cygni and Telescopic Limiting Magnitudes},
  year = {1992},
  journal = {The Journal of the American Association of Variable Star Observers},
  volume = {21},
  pages = {63-15},
  month = {06/1992},
  url = {http://articles.adsabs.harvard.edu/full/1992JAVSO..21...63G},
}