@article {Drummond:2014ffa,
	title = {{A Symbol of Uniqueness: The Cluster Bootstrap for the 3-Loop MHV Heptagon}},
	journal = {JHEP},
	volume = {03},
	year = {2015},
	pages = {072},
	doi = {10.1007/JHEP03(2015)072},
	author = {Drummond, James M. and Papathanasiou, Georgios and Spradlin, Marcus}
}
