1. V. S. Fomenko, Emission Properties of Materials (National Technical Information Service, U.S. Department of Commerce, Springfield, 1972; Naukova Dumka, Kiev, 1981).
2. A. P. Babichev, A. M. Babushkina, et al., in Handbook of Physical Quantities, Ed. by I. S. Grigoriev and E. Z. Meilikhov (Energoatomizdat, Moscow, 1991; CRC, Boca Raton, 1997).
3. Kh. I. Ibragimov and V. A. Korol’kov, Electron Work Function in Physicochemical Research (Internet Inzhiniring, Moscow, 2002) [in Russian].
4. Yu. I. Malov, A. V. Onishchenko, and L. I. Mironkova, Fiz. Met. Metalloved. 47, 889 (1979).
5. F. A. Kuijpers, Philips Res. Rep., Suppl. 28, 1 (1973).