%0 Journal Article %A William F. Sharpe %T Factor models, CAPMs,and the ABT %D 1984 %R 10.3905/jpm.1984.408982 %J The Journal of Portfolio Management %P 21-25 %V 11 %N 1 %U https://jpm.pm-research.com/content/iijpormgmt/11/1/21.full.pdf