1. J. E. Jacobs, in Research Techniques in Nondestructive Testing (Academic Press, New York, 1970), Chap. 3.
2. M. G. Maginness and L. Kay, Radio and Elec. Eng. 41, 91 (1971).
3. B. B. Brenden, Mats. Res. and Stds. 11, 16 (1971).
4. G. Wade, ed. Acoustical Holography (Plenum Press, New York, 1972), Vol. 4, Sec. V.
5. J. L. Kreuzer and P. E. Vogel in Acoustical Holography (Plenum Press, New York, 1969), Vol. 3, Chap. 5.