Investigation of Fish-Eye Lenses for Small-UAV Aerial Photography. - Alex Gurtner; Duncan G. Greer; Richard Glassock; Luis Mejías; Rodney A. Walker; Wageeh W. Boles (IEEE Trans. Geosci. Remote. Sens., 2009)

GPS Fault Detection with IMU and Aircraft Dynamics. - Troy S. Bruggemann; Duncan G. Greer; Rodney A. Walker (IEEE Trans. Aerosp. Electron. Syst., 2011)