Before revision: Fehr & Schmidt's March 2005 response to Shaked's critique Anger and Guilt: An Alternative to Inequity Aversion Models – Raúl López Pérez defines the Fehr and Schmidt IA model mathematically as well as proposing a different formulational of 'emotional' deviations from rationality.
After revision: Fehr & Schmidt's March 2005 response to Shaked's critique