4David Joulfaian, David Richardson. Who Takes Ad-vantage of Tax -Deferred Saving Programs : Evidencefrom Federal Income Tax Data [J]. National TaxJournal, 2001,Vol. 54,No. 3 : 669 - 688.
6Leslie E. Participation in and Contributions to 401 (k)Pension Plans: Evidence from Plan Data [J]. TheJournal of Human Resources, 1999,30 (2): 311-325.