1. 1) A. Pacz: U.S. Patent No. 1387900 (1920).
2. 2) 津村善重:軽金属,19(1956),59–65.
3. 3) B. M. Thall and B. Chalmers: J. Inst. Metals, 77 (1950), 79–97.
4. 4) S. Justi, K. Körben and K. Löhberg: GIESSERI FORSCHUNG, 24 (1972), 37–44.
5. 5) 津村善重:軽金属,16(1955),135–143.