3[1]Bryzek J, Petersen K, McCulley W. Micromachines on the March. IEEE Spectrum, May 1994, pp.20-31.
4[2]Spearing S M, Chen K S. Micro-Gas Turbine Engine Material and Structures. Presented at the 21st Annual Cocoa Beach Conference and Exposition on Composites, Advanced Ceramics, Material and Structures, January 1997.