%0 Journal Article %A Robert G. Kirby %T Lessons learned and never learned %D 1979 %R 10.3905/jpm.1979.408710 %J The Journal of Portfolio Management %P 52-55 %V 6 %N 1 %U https://jpm.pm-research.com/content/iijpormgmt/6/1/52.full.pdf