Diagrammatic proof of the BCFW recursion relation for gluon amplitudes in QCD P.D. Draggiotis, R.H.P. Kleiss, A. Lazopoulos and C.G. Papadopoulos Eur. Phys. J. C, 46 3 (2006) 741-750 Published online: 31 March 2006 DOI: 10.1140/epjc/s2006-02484-y