@ARTICLE {2849,
author={P. Zanardi and N. Paunkovic},
doi={10.1103/PhysRevE.74.031123},
journal={Physical Review E},
title={Ground state overlap and quantum phase transitions},
year={2006},
month={January},
volume={74},
number={-},
pages={031123-031123},
ISSN={2470-0045}
}