While skimming through this paper, I was reminded of earlier work:

1. An Operator Product Expansion for Polygonal null Wilson Loops
2. Bootstrapping Null Polygon Wilson Loops
3. Pulling the straps of polygons

This in turn lead me to more recent stuff:

1. Space-time S-matrix and Flux-tube S-matrix at Finite Coupling
2. Space-time S-matrix and Flux tube S-matrix II. Extracting and Matching Data
3. Space-time S-matrix and Flux-tube S-matrix III. The two-particle contributions
4. On the collinear limit of scattering amplitudes at strong coupling
5. Space-time S-matrix and Flux-tube S-matrix IV. Gluons and Fusion
6. Adjoint BFKL at finite coupling: a short-cut from the collinear limit

My task during the coming fall is to figure out if this is related in any way to my own work on scattering amplitudes.