@article{Zhang2016a,
  author = "S.-R. Zhang and J. M. Holt and P. J. Erickson and L. P. Goncharenko and M. J. Nicolls and M. McCready and J. Kelly",
  title = "Ionospheric ion temperature climate and upper atmospheric long-term cooling",
  year =  2016 ,
  journal = "J. Geophys. Res. Space Physics",
  publisher = "American Geophysical Union",
  number = 121,
  keywords = "pfisr, sondrestrom",
  doi = "10.1002/2016JA022971",
  url = "https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2016JA022971"
}


@article{Zhang2010a,
  author = "S.-R. Zhang and J. M. Holt and A. P. van Eyken and C. Heinselman and M. McCready",
  title = "IPY observations of ionospheric yearly variations from high- to middle-latitude incoherent scatter radars",
  year =  2010 ,
  journal = "J. Geophys. Res.",
  volume = 115,
  keywords = "amisr, pfisr, sondrestrom",
  doi = "10.1029/2009JA014327"
}