PT - JOURNAL ARTICLE ED - Perold, André F TI - Invited Editorial Comment AID - 10.3905/JPM.2009.36.1.004 DP - 2009 Oct 31 TA - The Journal of Portfolio Management PG - 4--5 VI - 36 IP - 1 4099 - https://pm-research.com/content/36/1/4.short 4100 - https://pm-research.com/content/36/1/4.full