1. Lumine scence of Ce3+ and Tb3+ in M3(PO4)2 (M = Sr,Ba)
Materials Chemistry and Physics, Volume 16, Issue 1, January 1987, Pages 63-66
M. J. J. Lammers, H. C. G. Verhaar and G. Blasse
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http://dx.doi.org/ 10.1016/0254-0584(87)90038-1