RT Journal Article SR Electronic T1 Saving Estate Taxes for the du Ponts JF The Journal of Portfolio Management FD Institutional Investor Journals SP 64 OP 69 DO 10.3905/jpm.1979.408701 VO 5 IS 4 A1 George Cooper YR 1979 UL https://pm-research.com/content/5/4/64.abstract AB