@article{Nicolls2007a, author = "M. J. Nicolls and C. J. Heinselman and E. A. Hope and S. Ranjan and M. C. Kelley and J. D. Kelly", title = "Imaging of Polar Mesosphere Summer Echoes with the 450 MHz Poker Flat Advanced Modular Incoherent Scatter Radar", year = 2007 , journal = "Geophys. Res. Lett.", volume = 34, number = 2, keywords = "amisr, pfisr", doi = "10.1029/2007GL031476" }