Author A.M. Abakumov, A.A. Tsirlin, J.M. Perez-Mato, V. Petříček, H. Rosner, T. Yang, M. Greenblatt Laboratory / Department Department of Structure Analysis DOI 10.1103/PhysRevB.83.214402 Postscript Physical Review B 83 (2011) 214402(1)-214402(10). Date 2011