1. A. Mortensen and S. Suresh, “Functionally graded metals and metal-ceramic composites: Part 1 Processing,” Int. Mater. Rev., 40, No. 6, 239–265 (1995).
2. S. Suresh and A. Mortensen, Fundamentals of Functionally Graded Materials, IOM Communications Ltd, London (1998).
3. T. Hirai and L. Chen, “Recent and prospective development of functionally graded materials in Japan,” Mater. Sci. Forum, 308–311, 509–514 (1999).
4. M. M. Gasik, “Functionally graded materials: bulk processing techniques,” Int. J. Mater. Prod. Tec., 39, No. 1, 20–29 (2010).
5. M. M. Nemat-Allal, M. H. Ata, M. R. Bayoumi, and W. Khair-Eldeen, “Powder metallurgical fabrication and microstructural investigations of aluminum/steel functionally graded material,” Mater. Sci. Appl., 2, No. 12, 1708–1718 (2011).