P.P. Fedorov, M.N. Mayakova, S.V. Kuznetsov, V.A. Maslov, N.I. Sorokin, A.E. Baranchikov, V.K. Ivanov, A.A. Pynenkov, M.A. Uslamina, K.N. Nishchev. Phase diagram of the NaF-CaF2 system and the electrical conductivity of a CaF2-based solid solution. // Russian Journal of Inorganic Chemistry. 2016. V.61. #11. Pp.1472-1478.