@inproceedings{inproceedings3de24929,
title   = {Charmonium - pion cross section from QCD sum rules},
author = {Nielsen, Marina and Navarra, Fernando Silveira and Carvalho, Raquel Marques de and Krein, Gastão},
year = {2002},
publisher = {SBF},
booktitle   = {Reunião de trabalho sobre fisica nuclear no brasil}
}