1. 1) Ultra-Fine Particles, a special issue of Solid State Physics, AGNE Publ. 1984.
2. 2) Ultra-Fine Particles-Science and Its Applications, Jpn. Chemical Soc., the Elements of Chemistry, No. 48 (1985).
3. 3) Micro-Clusters, ed. A. Sugano, a special issue of Butsuri, Phys. Soc. Jpn. (1987).
4. 4) T. Kobayashi: Frontiers of Physics, No. 16 (1986), 57;
5. A. Sugano: ibid, No. 25 (1989), 64.