1. A. A. Frishberg, Zh. Prikl. Spektr.,5, 12 (1966).
2. A. A. Frishberg and V. V. Nédler, Collection in Memory of G. S. Landsberg [in Russian], Izd. Akad. Nauk SSSR, Moscow (1969).
3. N. F. Zakhariya, Proceedings of the 10th All-Union Conference on Spectroscopy [in Russian], Izd. L'vov Gos. Univ. (1958).
4. V. L. Ginzburg, Author's Abstract of Candidate's Dissertation [in Russian], Moscow (1963).
5. P. DeGregorio and G. Rossi, La Metallurgia Italiana, No. 3, 374 (1969).