I will discuss an approach to integrable models from afour-dimensional Chern-Simons-type gauge theory. For introductionplease have a look at E. Witten arXiv:1611.00592 or K. CostelloarXiv:1308.0370. It might be interesting to look into some Feynmandiagram computations in my paper arXiv:1709.09993 with Edward andKevin (e.g. section 4 and section 5.2). If I have time I can come tomore recent developments.