1. Marsden, J. E. Hamiltonian systems with spin, Canad. Math. Bull., 12, (1969), 203-208. (pdf)

  2. Marsden, J. E. Non smooth geodesic flows and classical mechanics, Canad. Math. Bull., 12, (1969), 209-212. (pdf)

  3. Ebin, D. G. and J. E. Marsden Groups of diffeomorphisms and the solution of the classical Euler equations for a perfect fluid, Bull. Amer. Math. Soc., (N. S.), 75, (1969), 962-967. (pdf)