@article{articlea72edae8,
title   = {QCD sum rule approach for the light scalar mesons as four-quark states},
author = {Brito, T V and Navarra, Fernando Silveira and Nielsen, Marina and Bracco, M E},
year = {2005},
doi = {10.1016/j.physletb.2005.01.008},
journal   = {Physics Letters B}
}