A. V. Teterskii, V. A. Morozov, S. Yu. Stefanovich, and B. I. Lazoryak
Dielectric and Nonlinear Optical Properties of the Ca9R(PO4)7 (R = Ln) Phosphates
Russian Journal of Inorganic Chemistry
Vol. 50, No. 7, July 2005, pp. 986-989
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