Charles E. Keffer

Coherent backscatter: measurement of the retroreflective BRDF peak exhibited by several surfaces relevant to ladar applications

Billy E. Johnson, Thomas J. Papetti, William E. Walker, 2007, SPIE Optical Engineering + Applications.

Advanced measurements optical range (AMOR) ladar test facility

Thomas J. Papetti, Charles E. Keffer, Eddie Johnson, 2007, SPIE Defense + Commercial Sensing.

MRDF and BRDF measurements of low-scatter materials

Billy E. Johnson, Thomas J. Papetti, William E. Walker, 2007, SPIE Defense + Commercial Sensing.