%0 Journal Article %A Keith P. Ambachtsheer %T Where are the Customers' Alphas? %D 1977 %R 10.3905/jpm.1977.52 %J The Journal of Portfolio Management %P 52-56 %V 4 %N 1 %U https://jpm.pm-research.com/content/iijpormgmt/4/1/52.full.pdf