TY - JOUR T1 - Invited Editorial Comment JF - The Journal of Portfolio Management SP - 4 LP - 5 DO - 10.3905/JPM.2009.36.1.004 VL - 36 IS - 1 A2 - Perold, André F Y1 - 2009/10/31 UR - https://pm-research.com/content/36/1/4.abstract N2 - ER -