with Bryant, R; Chern, SS; Griffiths, PA, Exterior Differential Systems,
in Proceedings of the 1980 Beijing Symposium on Differential Geometry and Differential Equations (Beijing, 1980), edited by Chern, SS; Wu, WT, vol. 1
pp. 219-338, Science Press; Gordon & Breach Science Publishers, ISBN 0-677-16420-3
(last updated on 2018/12/17)
This is a brief introduction to the ideas of exterior
differential systems. It was later expanded and became
the basis of our 1991 book with
Gardner and Goldschmidt of the same title.