RT Journal Article SR Electronic T1 Portfolio selection through hierarchies JF The Journal of Portfolio Management FD Institutional Investor Journals SP 16 OP 21 DO 10.3905/jpm.1980.408749 VO 6 IS 3 A1 Thomas L. Saaty A1 Paul C. Rogers A1 Ricardo Pell YR 1980 UL https://pm-research.com/content/6/3/16.abstract AB