@article{10121,
  author = {W. Sieber and Ludwig Oster},
  title = {Drifting subpulse behaviour of PSR\textquoterights 0943 + 10 and 2303 + 30},
  year = {1975},
  journal = {Astronomy and Astrophysics},
  volume = {38},
  pages = {325-327},
  url = {http://articles.adsabs.harvard.edu/full/1975A\%26A....38..325S},
  note = {JILA Pub. 1291},
}