1. J. Van Suchtelen, Product properties: a new application of composite materials, Phillips Research Report, 27, 28 (1972).
2. R. M. Mahamood, E. T. Akinlabi, M. Shukla, S. Pityana, Functionally grading: An Overview, Proceedings of the World Congress on Engineering, vol. III, 2012, WCE, July 4-6, 2012, London, UK.
3. Effects of material inhomogeneity on the dynamic behavior of cracked piezoelectric solids: a BIEM approach
4. Green's function for the vector wave equation in a mildly heterogeneous continuum
5. 3-D and 2-D Dynamic Green's functions and time-domain BIEs for piezoelectric solids