1973

4.             V. S. Kozhukharov
                Phase equilibrium, glass formation and glass properties in
                TeO2 - V2O5 - ZnO  and  TeO2 - V2O5 - Fe2O3 system.
                Ph. D. Thesis , Sofia  (1973) (in Bulgarian)

5.             M. R. Marinov. V. S. Kozhukharov, Y. N.  Pavlova
                Phase equilibrium and electric conductivity in the system TeO2 - Fe2O3.
                Compt. rend. Acad. Bulg. Sci. 26 (1973) 343.