1. L.E. Holder, C. Kennedy, L. Long, G. Dubé, IEEE J. Quantum Electron. 28, 986 (1992)
2. N.S. Prasad, U.N. Singh, F.E. Hovis, in Earth Science Technology Conference, ESTC-06, College Park, MD, 27–29 June 2006
3. F.E. Hovis, C. Culpepper, T. Schum, G. Witt, Proc. SPIE 5653, 198 (2005)
4. N. Prasad, U. Singh, F. Hovis, D. Armstrong, Proc. SPIE 6214, 263 (2004)
5. F. Hovis, J. Wang, Proc. SPIE 6555 (2007)