2) G. A. Burell and L. Peter, Jr.: Pulse Propagation in Lossy Media Using the Low Frequency Window for Video Pulse Application, The Ohio State Univ. Electro Science Lab. Report, 1/44 (1980)
3) B. S. Melton: Electromagnetic Prospecting Method, 1937, U. S. Patent, 2,077,707, Apr. 29 (1937)
4) J. D. Young, R. Caldecott and L. Peter, Jr.: Under Ground Radar Research at Ohio State University, IEEE AP Newsletter, 21-4, 4/8, August (1979)