%0 Journal Article %A Arthur Zeikel %T After 50 years, nothing new nor likely %D 1979 %R 10.3905/jpm.1979.408706 %J The Journal of Portfolio Management %P 26-35 %V 6 %N 1 %U https://jpm.pm-research.com/content/iijpormgmt/6/1/26.full.pdf