1. Exposure Draft 14 -Accounting for Research and Development;Accounting Standards Committee,1975
2. Exposure Draft 17 -Accounting for Research and Development -Revised;Accounting Standards Committee,1976
3. Statement of Standard Accounting Practice No. 13 -Accounting for Research and Development Expenditures;Accounting Standards Committee,1989
4. The Effect of Pension Accounting on Corporate Pension Asset Allocation;Eli Amir;Review of Accounting Studies,2010
5. Empirical strategies in labor economics;Joshua D Angrist;Handbook of Labor Economics,1999