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 88 DO 10.3905/jpm.1981.408792 VO 7 IS 2 A1 Raymond Goldie A1 Keith P Ambachtsheer YR 1981 UL https://pm-research.com/content/7/2/88.abstract AB