RT Journal Article SR Electronic T1 You can't diversify without diversifying JF The Journal of Portfolio Management FD Institutional Investor Journals SP 5 OP 11 DO 10.3905/jpm.1982.408842 VO 8 IS 2 A1 Thomas M. Tole YR 1982 UL https://pm-research.com/content/8/2/5.abstract AB