1. About double molybdates of alkali and divalent elements;Efremov;Zhurnal Neorg. Khimii.,1972
2. The double tungstates and molybdates of alkali and some divalent elements;Efremov;Neorg. Mater.,1975
3. Crystal structures of Na2,20Zn0,90(MoO4)2 and Na5Sc(WO4)4;Efremov;Kristallografiya,1975
4. Phase diagram of Na2MoO4–MgMoO4 system;Efremov;Zhurnal Neorg. Khimii.,1976
5. Crystal Chemistry of Some Double Salts of with Tetrahedral EO4 Anions, Ph.D. thesis;Efremov,1976