Hard-core bosonization of the one-dimensional t-J model F. Pan, M.-X. Xie, J.-J. Lin, X.-G. Xue and J. P. Draayer Eur. Phys. J. B, 72 4 (2009) 479-484 Published online: 20 November 2009 DOI: 10.1140/epjb/e2009-00393-x