RT Journal Article SR Electronic T1 Daily returns and size-related premiums JF The Journal of Portfolio Management FD Institutional Investor Journals SP 41 OP 47 DO 10.3905/jpm.1987.409097 VO 13 IS 2 A1 Donald B. Keim YR 1987 UL https://pm-research.com/content/13/2/41.abstract AB