%0 Journal Article %A Paul D. Kaplan %A Laurence B. Siegel %T Portfolio Theory is Still Alive and Well %D 1994 %R 10.3905/joi.3.3.45 %J The Journal of Investing %P 45-46 %V 3 %N 3 %U https://joi.pm-research.com/content/iijinvest/3/3/45.full.pdf