1. V. I. Gol’danskii, Physical Chemistry of Positron and Positronium (Nauka, Moscow, 1968) [in Russian].
2. V. I. Grafutin and E. P. Prokop’ev, Usp. Fiz. Nauk 172, 67 (2002) [Phys. Usp. 45, 59 (2002)].
3. V. I. Grafutin, E. P. Prokop’ev, Yu. A. Novikov, and V. P. Shantarovich, in Proceedings of the Intern. ITEP School of Physics, Moscow, Ed. A. L. Suvorov et al. (Akademprint, Moscow, 2002), p. 207.
4. E. P. Prokop’ev, S. P. Timoshenkov, V. I. Grafutin, G. G. Myasishcheva, et al., Positronics of Ion Crystals, Semiconductors, and Metals (MIET, Moscow, 1999) [in Russian].
5. V. I. Grafutin, E. P. Prokop’ev, S. P. Timoshenkov, and Yu. V. Funtikov, Nanotekhnika, No. 4, 33 (2008).