RT Journal Article SR Electronic T1 Risk and Return Revisited JF The Journal of Portfolio Management FD Institutional Investor Journals SP 9 OP 14 DO 10.3905/jpm.1997.409608 VO 23 IS 3 A1 Burton G. Malkiel A1 Yexiao Xu YR 1997 UL https://pm-research.com/content/23/3/9.abstract AB