%0 Journal Article %A Graciela Chichilnisky %A Geoffrey Heal %T Managing Unknown Risks %D 1998 %R 10.3905/jpm.1998.409649 %J The Journal of Portfolio Management %P 85-91 %V 24 %N 4 %U https://jpm.pm-research.com/content/iijpormgmt/24/4/85.full.pdf