RT Journal Article SR Electronic T1 Have the Benefits of International Diversification Diminished? JF The Journal of Fixed Income FD Institutional Investor Journals SP 27 OP 34 DO 10.3905/jfi.1994.408110 VO 4 IS 2 A1 Thomas Iben A1 Robert B Litterman YR 1994 UL https://pm-research.com/content/4/2/27.abstract AB