Non-equivalence between Heisenberg XXZ spin chain and Thirring model T. Fujita, T. Kobayashi, M. Hiramoto and H. Takahashi Eur. Phys. J. C, 39 4 (2005) 511-518 Published online: 15 February 2005 DOI: 10.1140/epjc/s2004-02093-x