@article{Sojka2009b,
  author = "J. J. Sojka and M. J. Nicolls and C. J. Heinselman and J. D. Kelly",
  title = "The PFISR IPY observations of ionospheric climate and weather",
  year =  2009 ,
  journal = "J. Atmos. Solar-Terr. Phys.",
  volume = 71,
  number = 6,
  pages = "771-785",
  keywords = "amisr, pfisr",
  doi = "10.1016/j.jastp.2009.01.001"
}