1. I.M. Anderson, D. Catalano Ferraioli, M.E. Fels, Darboux integrable systems of Moutard type, in preparation
2. Exterior differential systems with symmetry;Anderson;Acta Appl. Math.,2005
3. Transformation groups for Darboux integrable systems;Anderson,2009
4. I.M. Anderson, M.E. Fels, Bäcklund transformations and symmetry reduction of differential systems, in preparation
5. General solutions of nonlinear equations in the geometric theory of the relativistic string;Barbashov;Comm. Math. Phys.,1982