1. W. W. Beeman and H. Friedman, Phys. Rev., 56, 392 (1939).
2. A. I. Kostarev, Zh. éksp. Teor. Fiz., 11, 60 (1941).
3. M. A. Blokhin, X-Ray Physics [in Russian], Gos. Izd. Tekh. Teor. Lit., Moscow (1957).
4. A. Maizel, G. Leonhardt, and R. Sargan, X-Ray Spectra and Chemical Bonding [in Russian], Naukova Dumka, Kiev (1981).
5. L. N. Mazalov, X-Ray Spectra [in Russian], Institute of Inorganic Chemistry, Siberian Division, Russian Academy of Sciences, Novosibirsk (2003).