Three-gluon Green functions: low-momentum instanton dominance and zero-crossing J. Rodríguez-Quintero, A. Athenodorou, D. Binosi, Ph. Boucaud, F. De Soto, J. Papavassiliou and S. Zafeiropoulos EPJ Web Conf., 137 (2017) 03018 Published online: 22 March 2017 DOI: 10.1051/epjconf/201713703018