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Olsen, Gerhard Henning; Aschauer, Ulrich Johannes; Spaldin, Nicola A.; Selbach, Sverre Magnus; Grande, Tor (2016). Origin of ferroelectric polarization in tetragonal tungsten-bronze-type oxides. Physical review. B - condensed matter and materials physics, 93(18) American Physical Society 10.1103/PhysRevB.93.180101