1. N. R. Gall’ and E. V. Rut’kov, Surface Physics of Solids. Graphene and Graphite on Solid Surfaces (Politekhn. Univ., St. Petersburg, 2013), p. 88 [in Russian].
2. E. P. Sheshin, Surface Structure and Autoemission Properties of Carbon Materials (MFTI, Moscow, 2001) [in Russian].
3. D. P. Bernatskii and V. G. Pavlov, Bull. Russ. Acad. Sci.: Phys. 73, 673 (2009).
4. N. R. Gall, Physics and Applications of Graphene – Experiments, Ed. by S. Mikhailov (InTech, Rijeka, Croatia, 2011), p. 209.
5. Th. Beach and R. Vanselow, Appl. Phys. 4, 265 (1974).