A generalized AKNS systems introduced and discussed recently in \cite{dGHM} are considered. It was shown that the dressing technique both in matrix pseudo-differential operators and formal series with respect to the spectral parameter can be developed for these hierarchies.
Cite
@article{arxiv.hep-th/9412005,
title = {Dressing Technique for Intermediate Hierarchies},
author = {P. Holod and S. Pakuliak},
journal= {arXiv preprint arXiv:hep-th/9412005},
year = {2009}
}