Vertex functions of Coulomb gauge Yang--Mills theory
  The canonical recursive Dyson--Schwinger equations for the three-gluon and ghost-gluon vertices are solved numerically. The employed truncation includes several previously neglected diagrams and includes back-coupling effects. We find an infrared finite ghost-gluon vertex and an infrared diverging three-gluon vertex. We also compare our results with those obtained in previous calculations, where bare vertices were used in the loop diagrams. 
Markus Q. Huber, Davide R. Campagnari, Hugo Reinhardt
hep-ph hep-th