[1] F.
Cametti, G. Jona-Lasinio, C. Presilla, F.L. Toninelli,
Comparison between quantum and classical dynamics
in the effective action formalism,
Proceedings of the International School of Physics ``Enrico Fermi'', Course CXLIII,
edited by G. Casati, I. Guarneri, U. Smilansky (IOS Press, Amsterdam 2000), p. 431-448.
quant-ph/9910065