The following article appeared in Appl. Phys. Lett. 90, 242918 (2007) and may also be found at http://link.aip.org/link/?APL/90/242918 .
A.R. Akbarzadeh, L. Bellaiche, Jorge Iniguez, and David Vanderbilt, Theoretical phase diagram of ultrathin films of incipient ferroelectrics (in PDF format).
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