RT Journal Article SR Electronic T1 A Short-Term Approach to Asset Allocation JF The Journal of Portfolio Management FD Institutional Investor Journals SP 45 OP 49 DO 10.3905/jpm.1980.408769 VO 7 IS 1 A1 Mark Kritzman A1 James C. Ryan YR 1980 UL https://pm-research.com/content/7/1/45.abstract AB