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m
—RF
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4. B. P. Sobolev, K. B. Seiranian, L. S. Garashina, and P. P. Fedorov, “Phase diagrams of the SrF2-(Y, Ln)F3 systems. 1, 2,” J. Solid State Chem., 28, No. 1, 51–58 (1979); 39, No. 2, 17–24 (1981).
5. B. P. Sobolev and N. L. Tkachenko, “Phase diagrams of the BaF2-(Y, Ln)F3 systems,” J. Less-Common Met, 85, No. 2, 155–170 (1982).