1. Cavana PJ, Winters WF. PMR-15 Polyimide/graphite fiber composite fan blade. NAS CR 135113, February, 1976.
2. Edwards WM, Robertson IM. US Patent No. 2,710,853, 1955.
3. (a) Wang PC. US Patent No. 5,062,780;
4. (b) Wang PC. US Patent No. 5,093,465;
5. (c) Wang PC, Asbell WJ, Chuah HH, William PG. Polymer Engineering and Science 1994;34(1):6–11;