1. Fischer, A. E. and J. E. Marsden General relativity as a dynamical system on the manifold a of Riemannian metrics which cover diffeomorphisms, Springer Lecture Notes in Physics, 14, (1972), 176-188. (pdf)

  2. J. E. Marsden, D. G. Ebin, and A. E. Fischer [1972], Diffeomorphism groups, hydrodynamics and relativity, in Proc. of the 13th Biennial Seminar of Canadian Mathematical Congress, (J. Vanstone, ed.), 135-279. (pdf)

  3. Fischer, A. E. and J. E. Marsden [1972], The Einstein equations of evolution--a geometric approach, J. of Math. Phys., 13, No. 4, April 1972, 546-568. (pdf)

  4. Marsden, J. E. [1972], Darboux's theorem fails for weak symplectic forms, Proc. of the Amer. Math. Soc., 3, 590-592. (pdf)

  5. Fischer, A. E. and J. E. Marsden The Einstein evolution equations as a first-order quasi-linear symmetric hyperbolic system I, Comm. Math. Phys., 28, (1972), 1-38. (pdf)