RT Journal Article SR Electronic T1 Cloudy Days and Sunny Days JF The Journal of Investing FD Institutional Investor Journals SP 82 OP 83 DO 10.3905/joi.4.1.82 VO 4 IS 1 A1 Hammond, Dennis R. YR 1995 UL http://joi.pm-research.com/content/4/1/82.abstract AB