1. Model equations for long waves in nonlinear dispersive systems;Benjamin;Philos. Trans. Roy. Soc. London Ser. A,1972
2. A duality theorem for Willmore surfaces;Bryant;J. Differential Geom.,1984
3. Exterior differential systems;Bryant,1980
4. R. Bryant, S. S. Chern, R. Gardner, and P. Griffiths, Essays on exterior differential systems, in preparation.
5. Les systèmes différentielles extérieurs et leurs applications géométriques;Cartan,1945