Le. Saltini et A. Zadra, ALGEBRA OF NONLOCAL CHARGES IN SUPERSYMMETRIC NONLINEAR SIGMA-MODELS, International journal of modern physics A, 12(2), 1997, pp. 419-436
We propose a graphic method to derive the classical algebra (Dirac bra
ckets) of nonlocal conserved charges in the two-dimensional supersymme
tric nonlinear O(N) sigma model. As in the purely bosonic theory we fi
nd a cubic Yangian algebra. We also consider the extension of graphic
methods to other integrable theories.