Gauge-invariant summation of All QCD virtual gluon exchanges H. M. Fried, Y. Gabellini, T. Grandou and Y.-M. Sheu Eur. Phys. J. C, 65 3-4 (2010) 395-411 Published online: 10 December 2009 DOI: 10.1140/epjc/s10052-009-1224-7