Double-exchange model study of multiferroic RMnO3 perovskites S. Dong, R. Yu, S. Yunoki, J.-M. Liu and E. Dagotto Eur. Phys. J. B, 71 3 (2009) 339-344 Published online: 15 July 2009 DOI: 10.1140/epjb/e2009-00225-1