RT Journal Article SR Electronic T1 Performance Measurement in a Downside Risk Framework JF The Journal of Investing FD Institutional Investor Journals SP 59 OP 64 DO 10.3905/joi.3.3.59 VO 3 IS 3 A1 Frank A. Sortino A1 Lee N. Price YR 1994 UL https://pm-research.com/content/3/3/59.abstract AB