Absence of polar order in LuFe2O4 A. Ruff, S. Krohns, F. Schrettle, V. Tsurkan, P. Lunkenheimer and A. Loidl Eur. Phys. J. B, 85 8 (2012) 290 Published online: 20 August 2012 DOI: 10.1140/epjb/e2012-30296-6