1. R.Abraham & J.Marsden, Foundations of Mechanics, Benjamin-Cummings (1978).
2. C.Carathéodory, Calculus of variations and partial differential equations of first order, Part I, Holden-Day (1965).
3. P.A.M. Dirac, Canad. J. Math., 2 (1950), 129–148.
4. A. Lichnerowicz, C. R. Acad. Sci. Paris, A-280 (1975), 523–527.
5. M.R. Menzio & W.M. Tulczyjew, Ann. Inst. H. Poincaré, 27 (1978), 349–367.