@inproceedings{inproceedings90f07859,
title   = {New spin-functionals for Heisenberg spin- 1/2 chains with bond defects or exchange anisotropy},
author = {Líbero, Valter Luiz and Penteado, P. H. and Souza, F. C. and Prata, G. N.},
year = {2008},
publisher = {Centro Brasileiro de Pesquisas Físicas - CBPF},
booktitle   = {International Conference on Strongly Correlated Electron Systems - SCES}
}