1. V. I. Laptev, Yu. L. Suponitskii, and A. F. Vorob'ev,Zh. Neorg. Khim., 1982,27, 1935 [J. Inorg. Chem. USSR, 1982,27 (Engl. Transl.)].
2. V. I. Laptev, Yu. L. Suponitskii, and A. F., Vorob'ev.Zh. Neorg. Khim., 1987,32, 547, [J. Inorg. Chem. USSR, 1987,32 (Engl. Transl.)].
3. Yu. L. Suponitskii, V. G. Bodrov, and M. Kh. Karapet'yants,Tr. MKhTI im. D. I. Mendeleeva [Proc. D. I. Mendeleev Moscow Chem. -Technol. Inst.], 1973,75, 11 (in Russian).
4. Termicheskie konstanty veshchestv [Thermal Constants of Substances], Issues 1–10 Ed. V. P. Glushko, VINITI, Moscow, 1974–1982 (in Russian).
5. I. I. Klement'eva, G. A. Tulaeva, and S. K. Vasin,Fizkhim. i tekhnol. probl. pererab. miner. syrýa Kol'skogo p-va [Phys. -Chem. and Technol. Probl. of Process. Mineral Raw Materials of the Kola Peninsula], Apatity, 1989, 4, (in Russian).