RT Journal Article SR Electronic T1 Comment on ”Why a Weekend Effect?“ JF The Journal of Portfolio Management FD Institutional Investor Journals SP 93 OP 99 DO 10.3905/jpm.1993.93 VO 19 IS 2 A1 William T. Ziemba YR 1993 UL https://pm-research.com/content/19/2/93.abstract AB