The official citation for MadGraph and MadEvent v. 5:

• MadGraph 5: Going Beyond.
  Johan Alwall, Michel Herquet, Fabio Maltoni, Olivier Mattelaer and Tim Stelzer
  ​JHEP1106(2011)128, ​arXiv:1106.0522 [hep-ph]

The full set of citations

• MadGraph/MadEvent v. 4:
  g>MadGraph/MadEvent v4: The New Web Generation
  J. Alwall, P. Demin, S. de Visscher, R. Frederix, M. Herquet, F. Maltoni, T. Plehn, D.L. Rainwater and T. Stelzer
  ​JHEP0709(2007)028, ​arXiv:0706.2334 [hep-ph]

• Decay chains, decay widths:
  New Developments in MadGraph/MadEvent
  J. Alwall, P. Artoisenet, S. de Visscher, C. Duhr, R. Frederix, M. Herquet, O. Mattelaer
  ​arXiv:0809.2410 [hep-ph]

• Matching of matrix elements and parton showers using MadGraph/MadEvent+Pythia:
  QCD radiation in the production of heavy colored particles at the LHC
  J. Alwall, S. de Visscher, F. Maltoni
  ​JHEP0902(2009)017, ​arXiv:0810.5350 [hep-ph]

• MadDipole:
  Automation of the Dipole Subtraction Method in MadGraph/MadEvent
  R. Frederix, T. Gehrmann, N. Greiner
  ​JHEP09(2008)122, ​arXiv:0808.2128 [hep-ph]

• TopBSM, BSM physics in ttbar production:
  Top pair invariant mass distribution: a window on new physics
  R. Frederix and F. Maltoni
  ​JHEP01(2009)047, ​arXiv:0712.2355 [hep-ph]

• MadOnia, heavy quarkonium production in NRQCD:
  Automatic generation of quarkonium amplitudes in NRQCD
  P. Artoisenet, F. Maltoni and T. Stelzer
  ​JHEP02(2008)102, ​arXiv:0712.2770 [hep-ph]

• MadEvent: Automatic event generation with MadGraph
  F. Maltoni and T. Stelzer, JHEP 0302:027, 2003
  ​JHEP02(2003)027 , ​hep-ph/0208156

• MadGraph
  
  1. Automatic generation of tree level helicity amplitudes
     T. Stelzer and W.F. Long, Phys.
     Commun. 81 (1994) 357-371, ​hep-ph/9401258
  2. SMadGraph: Weak boson fusion production of supersymmetric particles at the LHC
     G.-C. Cho, K. Hagiwara, J. Kanzaki, T. Plehn, D. Rainwater, T. Stelzer
     ​Phys.Rev.D73:054002,2006, ​hep-ph/0601063

• HELAS
  
  1. HELAS: HELicity amplitude subroutines for Feynman diagram evaluations
     H. Murayama, I. Watanabe, and K. Hagiwara, 1991
     ​KEK-91-11
  2. HELAS and MadGraph/MadEvent with spin-2 particles
     K. Hagiwara, J. Kanzaki, Qiang Li, K. Mawatari
     ​Eur.Phys.J.C56(2008)435-447, ​arXiv:0805.2554

-- Main.JohanAlwall - 2011-07-14