1. R. Roberts, “Model Based Inversion of Ultrasound Data in Composites,” Proceedings Review of Progress in Quantitative Nondestructive Evaluation 37, D.E. Chimenti & L.J Bond, Eds., AIP 1949, N.Y., (2018). Article 120007.
2. J. Achenbach, A. Gautesen, and H. McMaken, Ray Methods for Waves in Elastic Solids, Pitman, Boston, (1982).
3. Achenbach, J.: Reciprocity in Elastodynamics. Cambridge University Press, Cambridge (2003)