@article{articleb5d17729,
title   = {Understanding close-lying exotic charmonia states within QCD sum rules},
author = {Martinez Torres, Alberto and Dias, Jorgivan Morais and Gushiken, Natália Kazumi and Navarra, Fernando Silveira and Nielsen, Marina},
year = {2017},
doi = {10.1016/j.nuclphysa.2017.06.022},
journal   = {Nuclear Physics A}
}