RT Journal Article SR Electronic T1 The battle of insider trading vs. market efficiency JF The Journal of Portfolio Management FD Institutional Investor Journals SP 47 OP 50 DO 10.3905/jpm.1980.408763 VO 6 IS 4 A1 Halbert S. Kerr YR 1980 UL https://pm-research.com/content/6/4/47.abstract AB