%0 Journal Article %A Gordon J. Alexander %T Efficient Sets, Short-Sellling, and Estimation Risk %D 1995 %R 10.3905/jpm.1995.409505 %J The Journal of Portfolio Management %P 64-73 %V 21 %N 2 %U https://jpm.pm-research.com/content/iijpormgmt/21/2/64.full.pdf