1. E. Nelson, Phys. Rev. 150, 1079 (1966); F. Guerra and P. Ruggiero, Phys. Rev. Lett. 31, 1022 (1973).
2. G. Parisi and Wu Yongshi, Sci. Sin. 24, 483 (1981). See also: Stochastic Quantization, edited by P.H. Damgaard and H. Huffel (World Scientific, Singapore, 1988).
3. See, e.g.: Monte Carlo Methods in Quantum Problems, edited by M.H. Kalos, NATO ASI series C v. 125 (Reidel, Dordrecht 1984); Proceedings of the Conference on Frontiers of Quantum Monte Carlo, LANL, September 1985, edited by J.E. Gubernatis, J. Stat. Phys. 43, 729-1244 (1986);
4. Monte Carlo Methods in Theoretical Physics edited by S. Caracciolo and A. Fabrocini, (ETS, Pisa 1991); Quantum Monte Carlo Methods in Condensed Matter Physics, edited by M. Suzuki, (World Scientific, Singapore 1993).
5. M. Caffarel and P. Claverie, J. Chem. Phys. 88, 1088 (1988); ibid. p. 1100.