@article{articled208fe7a,
title   = {Factorization breaking of four-quark condensates in the nambu–jona-lasinio model},
author = {Braghin, Fabio L. and Navarra, Fernando Silveira},
year = {2015},
doi = {10.1103/physrevd.91.074008},
journal   = {PHYSICAL REVIEW D}
}