• [1]

    C.Crnkovic,E.Witten,Covariant description of canonical formalism in geometrical theories,inThree Hundred Years of Gravitation,eds.S.Hawking and W.Isreal.[2] N.J.M.Wookhouse,Geometric Quautization,Clarendon Press,Oxford,UK1992.[3] R.Floreanini,R.Jaekiw,Phys.Rev.Lett.,59(1987)1873.[4] R.Floreanini,R.Jackiw,Phys.Lett.,B175(1986)428.