1. Wheeler, J. A. (1964). Geometrodynamics and the issue of the final state, inRelativity, Groups and Topology, DeWitt, B., and DeWitt, C., eds. (Gordon and Breach, New York).
2. Fischer, A., and Marsden, J. (1979). The initial value problem and the canonical formalism of general relativity, inGravitational Theories since Einstein, Hawking, S. W., and Israel, W., eds. (Cambridge University Press, Cambridge).
3. DeWitt, B. D. (1967). Quantum theory of gravity. I. The canonical theory,Phys. Rev.,160, 1113?1148.
4. DeWitt, B. (1970). Spacetime as a sheaf of geodesies in superspace, inRelativity, Carmeli, M., Fickler, S. and Witten, L., eds. (Plenum Press, New York).
5. Ebin, D., and Marsden, J. (1970). Groups of diffeomorphisms and the motion of an incompressible fluid,Ann. Math.,92, 102?163.