text:   Interference in the Spatial Ultimatum Game",2,"['New pre-print: we study how to interfere in a spatial Ultimatum Game to promote fairness at a minimal  cost   <LINK>  @Cedric_Perret13', 'We show that, to minimize the cost of incentive/intervention, it is important to distinguish the role (i.e. provider vs receiver): Promoting Fair Proposers, Fair Responders or Both? Cost-Efficient Interference in the Spatial Ultimatum Game']",21,02,371