Calculation

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Wang, J, J.B Neaton, H Zheng, V Nagarajan, S.B Ogale, B Liu, D Viehland, V Vaithyanathan, D.G Schlom, U.V Waghmare, N.A Spaldin, K.M Rabe, M Wuttig, and Ramamoorthy Ramesh. "Epitaxial BiFeO3 multiferroic thin film heterostructures." Science 299 (2003) 1719–1722.