Flat surfaces and stability structures by Haiden, F, Katzarkov, L, Kontsevich, M

“…We also introduce a number of tools to deal with surfaces of infinite area, where structures similar to those in cluster algebra appear.…”

Cluster adjacency properties of scattering amplitudes in N=4 supersymmetric Yang-Mills theory by Drummond, J, Foster, J, Gürdoğan, O

“…They generalize the Steinmann relations and are expressed in terms of the cluster algebras associated to Gr(4,n). In terms of the symbol, they dictate which letters can appear consecutively. …”