%0 Journal Article %A James R. Vertin %T What can the future tell us about the past? %D 1979 %R 10.3905/jpm.1979.408721 %J The Journal of Portfolio Management %P 63-66 %V 6 %N 1 %U https://jpm.pm-research.com/content/iijpormgmt/6/1/63.full.pdf