RT Journal Article SR Electronic T1 GSCI Collateralized Futures JF The Journal of Investing FD Institutional Investor Journals SP 75 OP 82 DO 10.3905/joi.2.2.75 VO 2 IS 2 A1 Scott L. Lummer A1 Laurence B. Siegel YR 1993 UL https://pm-research.com/content/2/2/75.abstract AB