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``Revisiting properties of ferroelectric and multiferroic thin  films under tensile strain from  first principles,''  Yurong Yang, Wei Ren, Massimiliano Stengel, X. H. Yan and L. Bellaiche, Physical Review Letters 109, 057602 (2012).
``Epitaxial short-period PbTiO3/BiFeO3 superlattices studied by first-principles calculations,''  Yurong Yang, Massimiliano Stengel, Wei Ren, X. H. Yan and L. Bellaiche, Physical Review B 86, 144114 (2012).
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