@article{Nicolls2012a, author = "M. J. Nicolls and D. C. Fritts and D. Janches and C. J. Heinselman", title = "Momentum flux determination using the multi-beam Poker Flat Incoherent Scatter Radar", year = 2012 , journal = "Ann. Geophys.", volume = 30, number = 6, pages = "945-962", keywords = "amisr, pfisr", doi = "10.5194/angeo-30-945-2012" }