各位同学，小弟最近急需如下几篇文章，不知哪位可以帮助找一下。感激不尽！（如果有必要，本人也愿意以每篇20个论坛币的价格购买）

Besley, T., and M. Gouveia (1994), "Alternative systems of health care provision", Economic Policy 19:199- 258.

Chalkley, M., and J.M. Malcomson (1998a), "Contracting for health services when patient demand does not reflect quality", Journal of Health Economics 17(1):1-19.

Ellis, R.P., and T.G. McGuire (1986), "Provider behavior under prospective reimbursement: cost sharing and supply", Journal of Health Economics 5:129-151.

Schlesinger, H., and E. Venezian (1986), "Insurance markets with loss-prevention activity: Profits, market structure, and consumer welfare", Rand Journal of Economics 17(2):227-238.