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Recently, Bern et al observed that a certain class of next-to-planar Feynman integrals possess a bonus symmetry that is closely related to dual conformal symmetry.
A. Galperin, E. Ivanov, S. Kalitsyn, V. Ogievetsky and E. Sokatchev, Unconstrained N=2 Matter, Yang-Mills and Supergravity Theories in Harmonic Superspace , Class. Quant. Grav. 1
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J. M. Drummond, J. Henn, V. A. Smirnov and E. Sokatchev, Magic identities for conformal four-point integrals , JHEP 01
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L. F. Alday and J. M. Maldacena, Gluon scattering amplitudes at strong coupling , JHEP 06
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F. C. S. Brown, Multiple zeta values and periods of moduli spaces M ¯ 0 , n ( R ) \overline{M}_{0,n}(R) , Annales Sci. Ecole Norm. Sup. 42
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2010
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2010
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2010
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J. M. Henn, Dual conformal symmetry at loop level: massive regularization , J. Phys. A44
2011
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2016
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2016
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2016
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2016
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2012
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2012
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J. M. Henn, Multiloop integrals in dimensional regularization made simple , Phys. Rev. Lett. 110
2013
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2014
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D. Parker, A. Scherlis, M. Spradlin and A. Volovich, Hedgehog bases for A n
2015
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2017
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2017
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D. Chicherin, J. Henn and V. Mitev, Bootstrapping pentagon functions , JHEP 05
2018
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2018
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