8Joseph E. Stiglitz. Pareto Efficient and Optimal Taxation and the New New Welfare Econom- ics[ R]. NBER Working Paper,No 2189,1987.
9Hana Polackova. Contingent Government Liabilities; A Hidden Risk for Fiscal Stability [ R]. World Bank Policy Research Working Paper,1998.
10William Russell Easterly. How Did Highly Indebted Poor Countries Become Highly Indebted.Reviewing Two Decades of Debt Relief [ R ]. World Bank Policy Research Working Paper 2225,1999.