Magnetization plateau and quantum phase transitions in a spin-orbital model Zu-Jian Ying, Angela Foerster, Xi-Wen Guan, Bin Chen and Itzhak Roditi Eur. Phys. J. B, 38 4 (2004) 535-539 Published online: 08 June 2004 DOI: 10.1140/epjb/e2004-00149-2