Correlation between the gamma-ray and the radio emissions
  In this paper, the correlation between the gamma-ray and the radio bands is investigated. The results show that there is a closer correlation between the gamma-ray emission and the high frequency (1.3mm, 230GHz) radio emission for maximum data than between the gamma-ray and the lower frequency (5GHz) radio emissions, which means that the gamma-ray is associated with the radio emission from the jet. 
J.H. Fan, G. Adam, G.Z. Xie, S.L. Cao, R.G. Lin, Y. Copin