Active Ground Optical Remote Sensing for Improved Monitoring of Seedling Stress in Nurseries. - Jan U. H. Eitel; Robert F. Keefe; Dan S. Long; Anthony S. Davis; Lee A. Vierling (Sensors, 2010)

Accuracy of WAAS-Enabled GPS-RF Warning Signals When Crossing a Terrestrial Geofence. - Lindsay M. Grayson; Robert F. Keefe; Wade T. Tinkham; Jan U. H. Eitel; Jarred D. Saralecos; Alistair M. S. Smith; Eloise G. Zimbelman (Sensors, 2016)

Hazards in Motion: Development of Mobile Geofences for Use in Logging Safety. - Eloise G. Zimbelman; Robert F. Keefe; Eva K. Strand; Crystal A. Kolden; Ann M. Wempe (Sensors, 2017)