https://cadipt.mie.utoronto.ca/publications/application-of-a-generalized-methodology-for-quantitative-thermal-diffusivity-depth-profile-reconstruction-in-manufactured-inhomogeneous-steel-based-materials/

Munidasa, M., Funak, F., and Mandelis, A., "Application of a Generalized Methodology for Quantitative Thermal Diffusivity Depth Profile Reconstruction in Manufactured Inhomogeneous Steel-Based Materials", Review of Progress in QNDE, Proceedings of the Twenty-Fourth Symposium held in San Diego, California, July 27-August 1, 1997; Edited by Donald O. Thompson and Dale E. Chimenti, Iowa State University, Ames, Plenum Press, Vol. 17A, pp. 469-476, 1998.