Exact ground states for two new spin-1 quantum chains, new features of matrix product states S. Alipour, V. Karimipour and L. Memarzadeh Eur. Phys. J. B, 62 2 (2008) 159-169 Published online: 11 April 2008 DOI: 10.1140/epjb/e2008-00143-8