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F. Loebbert, D. Müller and H. Münkler, Phys. Rev. D 101
Original
1912
Earlier work this paper cites.
H. M. Srivastava and P. W. Karlsson “Multiple gaussian hypergeometric serie”
1985
Earlier work this paper cites.

Similar

O. Zhdanov and A. Tsikh, Siberian Mathematical Journal 39
1998
Cited alongside, same era.
S. Friot and D. Greynat, J. Math. Phys. 53
Original
2012
Cited alongside, same era.
B. Ananthanarayan, S. Banik, S. Friot and S. Ghosh, manuscript in preparation
Cited in the paper.

Then

D. Chicherin, V. Kazakov, F. Loebbert, D. Müller and D. l. Zhong, Phys. Rev. D 96
Original
2017
Later among the works it cites.
D. Chicherin, V. Kazakov, F. Loebbert, D. Müller and D. l. Zhong, JHEP 05
Original
2018
Later among the works it cites.

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2020

The Double Box and Hexagon Conformal Feynman Integrals

Ananthanarayan, B., Banik, Sumit, Friot, Samuel et al.

Understand

The off-shell massless six-point double box and hexagon conformal Feynman integrals with generic propagator powers are expressed in terms of linear combinations of multiple hypergeometric series of the generalized Horn type.

These results are derived from 9-fold Mellin-Barnes representations obtained from their dual conformal Feynman parameter representations.
The individual terms in the presented expressions satisfy the differential equation that relates the double box in $D$ dimensions to the hexagon in $D+2$ dimensions.