1. D0 collaboration, V.M. Abazov et al., Forward-backward asymmetry in top quark-antiquark production, Phys. Rev. D 84 (2011) 112005 [ arXiv:1107.4995 ] [ INSPIRE ].
2. CDF collaboration, T. Aaltonen et al., Evidence for a mass dependent forward-backward asymmetry in top quark pair production, Phys. Rev. D 83 (2011) 112003 [ arXiv:1101.0034 ] [ INSPIRE ].
3. J.H. Kuhn and G. Rodrigo, Charge asymmetry in hadroproduction of heavy quarks, Phys. Rev. Lett. 81 (1998) 49 [ hep-ph/9802268 ] [ INSPIRE ].
4. J.H. Kuhn and G. Rodrigo, Charge asymmetry of heavy quarks at hadron colliders, Phys. Rev. D 59 (1999) 054017 [ hep-ph/9807420 ] [ INSPIRE ].
5. M. Bowen, S. Ellis and D. Rainwater, Standard model top quark asymmetry at the Fermilab Tevatron, Phys. Rev. D 73 (2006) 014008 [ hep-ph/0509267 ] [ INSPIRE ].