7[7]Merton,Robert C.Operation and Regulation in Financial Intermediation:A Functional Perspective,Cambridge,Mass.:Harvart University Graduate school of Business Administration Working Paper,1992.
8Farrel M J. The measurement of productive efficiency. Journal of Royal Stoical Society, Series A General, 1957,120(3):253-281
9Shepherd, R. W. (1 970), "Theory of Costand Production Functions, " Princeton University Press, Princeton, pp. 58-70
