最近要准备毕业论文开题，但是有两篇文献一直没有查到，而这两篇文献和我论文的关系非常密切，因此非常着急。不知道哪位朋友能够帮忙找一下。

十分感谢！

所需查找的两篇文献：

Li, David. 1992. “Public Ownership as a Sufficient Condition for the Soft Budget Constraint,” CREST Working Paper 93-07, Ann Arbor: University of Michigan Center for Research on Economic and Social Theory.

Li, David D. and Minsong Liang. 1998. “Causes of the Soft Budget Constraint: Evidence on Three Explanations,” J. Comp. Econ. 26:1, pp. 104-16.