Meth. Mod. Phys. volume 10 issue 4 pages 1350003 arxiv 0803.1340v2 doi 10.1142/S0219887813500035 DOI 10.1142/S0219887813500035 ↑ Arkani-Hamed, Nima; Cheng, Hsin-Chia; Luty, Markus A.; Mukohyama, Shinji (2004-05-29).