看你提问的是哪一个了,Baumal.W 那个是从eoq模型演化的,
W.J. Baumol, The Transactions Demand for Cash: An Inventory Theoretic Approach,” Quarterly Journal of Economics, 66: 545-556 (November 1952)
Miller-orr model 的话你可以搜索一下这两个人的名字,应该可以找到推导的文章
Mullins, D. and R. Homonoff (1976), “Applications of Inventory Cash Management Models,” in S.C. Myers, ed., Modern Developments in Financial Management, Frederick A. Praeger, Inc., New York
这篇应该对你也有用