Source: https://www.amf-france.org/sites/default/files/contenu_simple/colloque_journee/colloque_conseil_scientifique/Colloque%20du%20Conseil%20Scientifique%20du%206%20mai%202011%20-%20Regulation%20des%20marches%20de%20matieres%20premieres%20%20quel%20cadre%20envisager%20.pdf