@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"
}