3Ben-Zion,U. The Investment Aspect of Nonproduction Expenditure:An Empirical Test[J]. Journal of Economics and Business, 1978, (30) : 224--229.
4Hirschey,M. ,Weygandt,J. J. Amortisation Policy for Advertising and R&D Expenditures[J]. Journal of Accounting Research,1985,(23):326-335.
5Aboody,D. ,Lev,B. The Value Relevance of Intangibles:The Case of Software Capitalization[J]. Journal of Accounting Research,1998 , (Supplement) :161- 191.
6Barth, E. M. ,Clinch, G. Revalued Financial, Tangible, and Intangible Association with Share Price and Non- market-based Value Estimates[J]. Journal of Accounting Research, 1998, (Supplement) : 199--233.
7Bassi, Laurie, et al. Measuring Corporate Investment in Human Capital[C]// Blair, M. , Kochan, T. The New Relationship: Human Capital in the American Corporation. New York..Brookings Institute,2000:334 -382.
