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J. M. Drummond, J. Henn, V. A. Smirnov and E. Sokatchev, JHEP 0701
2007
Earlier work this paper cites.

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L. F. Alday and J. M. Maldacena, JHEP 0706
Original
2007
Cited alongside, same era.
N. Arkani-Hamed, F. Cachazo, C. Cheung and J. Kaplan, arXiv:0907.5418 [hep-th]
Original
Cited in the paper.
J. M. Drummond, J. Henn, G. P. Korchemsky and E. Sokatchev, arXiv:0807.1095 [hep-th]
Original
Cited in the paper.
A. Hodges, arXiv:0905.1473 [hep-th]
Original
Cited in the paper.
L. Mason and D. Skinner, arXiv:0909.0250 [hep-th]
Original
Cited in the paper.
N. Arkani-Hamed, F. Cachazo, C. Cheung and J. Kaplan, arXiv:0903.2110 [hep-th]
Original
Cited in the paper.

Then

J. M. Drummond, J. M. Henn and J. Plefka, JHEP 0905
Original
2009
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2009

The Grassmannian Origin Of Dual Superconformal Invariance

Arkani-Hamed, Nima, Cachazo, Freddy, Cheung, Clifford

Understand

A dual formulation of the S Matrix for N=4 SYM has recently been presented, where all leading singularities of n-particle N^{k-2}MHV amplitudes are given as an integral over the Grassmannian G(k,n), with cyclic symmetry, parity and superconformal invariance manifest.

In this short note we show that the dual superconformal invariance of this object is also manifest.
The geometry naturally suggests a partial integration and simple change of variable to an integral over G(k-2,n).
This change of variable precisely corresponds to the mapping between usual momentum variables and the "momentum twistors" introduced by Hodges, and yields an elementary derivation of the momentum-twistor space formula very recently presented by Mason and Skinner, which is manifestly dual superconformal invariant.