Justified changes in social preferences: the preference reversal principle revisited, with Salvador Barberà, Bernardo Moreno, Antonio Nicolò. Available at SSRN: https://ssrn.com/abstract=3848685, March 2022. Impartial Social Rankings: Some impossibility results, with Jorge Alcalde-Unzu and Riste Gjorgjiev. March 2022. Ex post group incentive compatibility in single-unit auctions, with Bernardo Moreno. June 2019. Preferences-based and type-based rules: When do they coincide?, with Salvador Barberà, Bernardo Moreno, Antonio Nicolò. November 2021.