6[5]Principles of Corporate Finance,Fifth Edition,Richard A.Brealey,Steward C.Myers McGraw-Hill,2001
7[6]Baber W,P.Fairfield,J.Haggard.1991.The Effect of Concern about Reported Income on Discretionary Spending Decisions:The case of Research and development.The Accounting Review,66(October):818-829.
8[7]Bertrand Horwitz,Richard kolodny.1980.The Economic Effect of Involuntary Uniformity in The Financial Reporting of R&D Expenditures.Journal of Accounting Research,vol.18,Supplement 38-74.
