1. Y. Sugiyama, Turon Kagaku Kogaku, p. 149, Kyoritsu-shuppan, Japan (1988).
2. A. Mizushina and R. Toei, Kagaku Kogaku Gairon, p. 103, Sangyo-tosho, Japan (1979).
3. C. L. Mantel, Kyuchaku Oyobi Kyuchakuzai, p. 1, Gihodo, Japan (1972).
4. See, for example, T. Hirose, One Point Physics 10, E and H, D and B, p. 59, Kyoritsu-shuppan, Japan (1989).
5. A superconducting filter to separate an oxygen and argon mixture