For instance, PRICE (Nordhaus and Popp, 1997), ENTICE (Popp, 2004) and ENTICE-BR (Popp, 2006) are not included because they apply the original DICE damage function, but AD-DICE is included. The model must be described in the peer-reviewed literature. If an earlier model version is described in a peer-reviewed article, presentation of the most recent version in a working paper or conference proceeding is considered sufficient.