1. S. Mamaev, Dissertation for Candidate’s Degree [in Russian], Gertsen State Pedagogical Institute, Leningrad (1962).
2. Yu. V. Rud’, Dissertation for Candidate’s Degree [in Russian], Physicotechnical Institute of the Academy of Sciences of the USSR, Leningrad (1965).
3. See also É. O. Osmanov, Dissertation for Candidate’s Degree [in Russian], Silicate Chemistry Institute, Leningrad (1965).