%0 Journal Article %A Meir I. Schneller %T Efficient frontiers in factor economies %D 1990 %R 10.3905/jpm.1990.409261 %J The Journal of Portfolio Management %P 23-25 %V 16 %N 2 %U https://jpm.pm-research.com/content/iijpormgmt/16/2/23.full.pdf