Fast computation of MadGraph amplitudes on graphics processing unit (GPU) K. Hagiwara, J. Kanzaki, Q. Li, N. Okamura and T. Stelzer Eur. Phys. J. C, 73 11 (2013) 2608 Published online: 05 November 2013 DOI: 10.1140/epjc/s10052-013-2608-2