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Several second order differential operators are shown to annihilate the YM and GR tree scattering amplitudes.
Zeilberger D., Journal of Computational and applied mathematics 32.3, 321-368 (1990)
1990
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Dixon L.,
1996
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Britto R., Cachazo F., Feng B., Witten E.,
2005
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Castro-Jiménez F.J. and Leykin A.,
2011
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2012
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Bjerrum-Bohr N.E.J., Bourjaily J.L., Damgaard P.H. and Feng B.,
2016
Cited alongside, same era.
Grayson D.R. and Stillman M.E.,
Cited in the paper.
Loebbert F., Mojaza M. and Plefka J.,
2018
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2018
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