1. Greenleaf, J. F. and S. A. Johnson: Algebraic reconstruction of spatial distributions of refractive index and attenuation in tissues from time-of-flight and amplitude profiles. Proceedings of Seminar on Ultrasonic Tissue Characterization. National Bureau of Standards Special Publication 453: 109–119, 1976.
2. Greenleaf, J. F., S. A. Johnson, S. L. Lee, G. T. Herman, and E. H. Wood: Algebraic reconstruction of spatial distributions of acoustic absorption within tissue from their two-dimensional acoustic projections. In: Green, Philip S.: Acoustical Holography. New York, Plenum Press, 1974, Volume 5, pp 591–603.
3. Greenleaf, J. F., S. A. Johnson, W. F. Samayoa, and C. R. Hansen: Refractive index by reconstruction: use to improve compound B-scan resolution. In: Kessler, L.: Acoustical Holography. New York, Acoustical Holography. 1977, Volume 7, pp 263–273.
4. Johnson, S. A., J. F. Greenleaf, A. Chu, J. D. Sjostrand, B. K. Gilbert, and E. H. Wood: Recon-struction of material characteristics from highly refraction distorted projections by ray tracing. Proceedings of Image Processing for 2-D and 3-D Reconstructions from Projections: Theory and Practice in Medical and Physical Sciences. Stanford, California, August 4–7, 1975, pp TUB2-1 - TUB2-4.
5. Johnson, S. A., J. F. Greenleaf, W. F. Samayoa, F. A. Duck, and J, D. Sjostrand: Reconstruction of three-dimensional velocity fields and other parameters by acoustic ray tracing. 1975 Ultrasonic Symposium Proceedings IEEE Catalog No. 75 CH09 94- 4SU: 46–51, 1975.