@article{Varney2009a,
author = "R. H. Varney and M. J. Nicolls and C. J. Heinselman and M. C. Kelley",
title = "Observations of polar mesospheric summer echoes using PFISR during the summer of 2007",
year = 2009 ,
journal = "J. Atmos. Solar-Terr. Phys.",
volume = 71,
number = 3,
pages = "470-476",
keywords = "amisr, pfisr",
doi = "10.1016/j.jastp.2009.01.002"
}