World-line techniques for resumming gluon radiative corrections at the cross-section level A.I. Karanikas, C.N. Ktorides and N.G. Stefanis Eur. Phys. J. C, 26 3 (2003) 445-455 Published online: 31 October 2002 DOI: 10.1140/epjc/s2002-01068-3