1. I. P. Bazarov and P. N. Nikolaev, Zh. Fiz. Khim 75(Suppl. 1), 598 (2001) [Russ. J. Phys. Chem. 75 (Suppl. 1), 159 (2001)].
2. A. Einstein, Collection of Scientific Works (Nauka, Moscow, 1966), Vol. 3, p. 134 [in Russian].
3. T. Markovich, E. Polturak, J. Bossky, and E. Farhi, Phys. Rev. Lett. 88, 195301 (2002).
4. Rare Gas Solids (Perg. Press, London, 1977), Vol. 2.
5. S. M. Stishov, Usp. Fiz. Nauk 171, 299 (2001) [Phys. Usp. 44, 285 (2001)].