1. Schungites — A New Carbonaceous Raw Material [in Russian], Kareliya Scientific Center, Petrozavodsk (1984).
2. S. V. Kholodkevich and V. V. Poborchii, Pis’ma Zh. Tekh. Fiz. 20(3), 22 (1994) [Tech. Phys. Lett. 20, 184 (1994)].
3. P. R. Buseck, S. J. Tsipursky, and R. Hettich, Science 257, 215 (1992).
4. S. V. Kholodkevich, A. V. Bekrenev, V. K. Donchenko, V. I. Domoroshchenkov, O. I. Kon’kov, V. V. Poborchii, E. I. Terukov, and I. N. Trapeznikova, Dokl. Ross. Akad. Nauk 330, 340 (1993).
5. L. S. Parfen’eva, I. A. Smirnov, A. Z. Zaidenberg, N. N. Rozhkova, and G. B. Stefanovich, Fiz. Tverd. Tela (St. Petersburg) 36, 234 (1994) [Phys. Solid State 36, 129 (1994)].