RT Journal Article SR Electronic T1 Portfolio size and estimation risk JF The Journal of Portfolio Management FD Institutional Investor Journals SP 60 OP 64 DO 10.3905/jpm.1986.409070 VO 12 IS 4 A1 Peter A. Frost A1 James E. Savarino YR 1986 UL https://pm-research.com/content/12/4/60.abstract AB