RT Journal Article SR Electronic T1 Another look at risk and reward in january and non–january months JF The Journal of Portfolio Management FD Institutional Investor Journals SP 79 OP 81 DO 10.3905/jpm.1990.409291 VO 16 IS 4 A1 William R Reichenstein YR 1990 UL https://pm-research.com/content/16/4/79.abstract AB