@article{Nicolls2007b,
author = "M. J. Nicolls and C. J. Heinselman",
title = "Three-dimensional measurements of traveling ionospheric disturbances with the Poker Flat Incoherent Scatter Radar",
year = 2007 ,
journal = "Geophys. Res. Lett.",
volume = 34,
number = 2,
keywords = "amisr, pfisr",
doi = "10.1029/2007GL031506"
}