Chiral symmetry and light resonances in hot and dense matter D. Cabrera, D. Fernández-Fraile and A. Gómez Nicola Eur. Phys. J. C, 61 4 (2009) 879-892 Published online: 16 December 2008 DOI: 10.1140/epjc/s10052-008-0831-z