RT Journal Article SR Electronic T1 Index Funds JF The Journal of Portfolio Management FD Institutional Investor Journals SP 53 OP 55 DO 10.3905/jpm.1976.408564 VO 2 IS 3 A1 Babson, David L. YR 1976 UL http://jpm.pm-research.com/content/2/3/53.abstract AB