The following article appeared in J. Appl. Phys. 94, 3299 (2003) and may also be found at http://link.aip.org/link/?JAP/94/3299 .
Morrel H. Cohen, J. B. Neaton, Lixin He, and David Vanderbilt, Extrinsic models for the dielectric response of CaCu$_3$Ti$_4$O$_12$ (in PDF format).
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