@article {Drummond:2018caf,
	title = {{Cluster adjacency and the four-loop NMHV heptagon}},
	journal = {JHEP},
	volume = {03},
	year = {2019},
	pages = {087},
	doi = {10.1007/JHEP03(2019)087},
	author = {Drummond, James and Foster, Jack and G{\"u}rdo{\u g}an, {\"O}mer and Papathanasiou, Georgios}
}
