1. R. Watanabe and A. Kawasaki [Recent Development of Functionally Gradient Materials for Special Application to Space Plane], Proc. Symp. A4 on Composite Materials, ICAM’91,Strasbourg, (1991), Eds.,T.Dibenedetto, L.Nicolais, and R, Watanabe, North-Holland, Amsterdam,(1992), pp.197.
2. M. Niino, T. Hirai and R, Watanabe: [Functionally Gradient Materials-High Temperature Use for Space Rocket], J. Japan Society of Composite Materials, 13 (1987), 257.
3. A. Kawasaki and R. Watanabe: Finite Element Analysis of Thermal Stress of the Metal/Ceramic Multi-Layer Composites with Controlled Compositional Gradients], J. Japan Inst. Metal s, 51 (1987), 525.
4. See for example, Proc. 1st Intern. Symp. on Functionally Gradient Materials, (1990), Sendai, Ed. M. Yamanouchi et al., FGM Forum,(1990).
5. R. Watanabe, A. Kawasaki and H. Takahashi:[Design, Fabrication and Evaluation of Functionally Gradient Material for High Temperature Use], “Mechanics and Mechanisms of Damage in Composites and Multi-Materials”, Ed., D. Baptiste, Mechanical Engineering Publications, Ltd., London, (1991), pp 914.