@article{Nicolls2009a,
author = "M. J. Nicolls and M. C. Kelley and R. H. Varney and C. J. Heinselman",
title = "Spectral observations of polar mesospheric summer echoes at 33 cm (450 MHz) with the Poker Flat Incoherent Scatter Radar",
year = 2009 ,
journal = "J. Atmos Solar-Terr. Phys.",
volume = 71,
number = 6,
pages = "662-674",
keywords = "amisr, pfisr",
doi = "10.1016/j.jastp.2008.04.019"
}