1. A. I. Gusev, Nanocrystalline Materials, Production Methods and Properties (Inst. Khim. Tverd. Tela UrO RAN, Yekaterinburg, 1988) [in Russian].
2. H. Gleiter, Nova Acta Leopold. NF 303, 343 (1997).
3. Yu. I. Petrov, Clusters and Small Clusters (Nauka, Mos-cow, 1986) [in Russian].
4. Yu. I. Petrov, Physics of Small Particles (Nauka, Mos-cow, 1982) [in Russian].
5. S. A. Nepiiko, Physical Properties of Small Metallic Par-ticles (Nauk. Dumka, Kiev, 1985) [in Russian].