RT Journal Article SR Electronic T1 Asset allocation under shortfall constraints JF The Journal of Portfolio Management FD Institutional Investor Journals SP 18 OP 23 DO 10.3905/jpm.1991.409309 VO 17 IS 2 A1 Martin L. Leibowitz A1 Stanley Kogelman YR 1991 UL https://pm-research.com/content/17/2/18.abstract AB