1. Blank, V.D., Denisov, V.N., Kirichenko, B.A., Kulnitskiy, B.A., Martusov, S.Yu., Mavrin, B.N., and Pereghogin, I.A., High-pressure transformation of single-crystal graphite to form molecular carbon-onions, Nanotechnology, 2007, vol. 18, pp. 1–4.
2. Bouldeulle, M., Koeberl, C., Langenhorst, F., and Masaitis, V., Diamond-graphite phase transitions in impact diamonds from the Popigai structure (Russia), Eur. Union Geosci., 1999, vol. 10, p. 636.
3. Ferroir, T., Dubrovinsky, L., El Goresy, A., Simonovici, A., Nakamura, T., and Gillet, Ph., Carbon polymorphism in shocked meteorites: evidence for new natural ultrahard phases, Earth Planet. Sci. Lett., 2010, vol. 290, pp. 150–154.
4. Galimov, E.M., Ivanovskaya, I.N., Klyuev, Yu.A., et al., Isotopic composition and crystalline structure of natural diamond and lonsdaleite polycrystals, Geokhimiya, 1980, vol. 18, no. 4, pp. 533–539.
5. Gnevushev, M.A., Zilberstein, A.Kh., and Krasheninnikova, G.E., Birefringence of diamonds from shock metamorphic rocks, Zapiski VMO, 1986, vol. 115, no. 4, pp. 442–445.