1. The frontier effect: State formation and violence in Colombia;Ballvé,2020
2. Frontiers and wars: The opium economy in Afghanistan;Goodhand;Journal of Agrarian Change,2005
3. Rules of the underworld;Hirschfeld;Sapiens,2016
4. The geography of badness: Mapping the hubs of the illicit global economy;Keefe,2013
5. War making and state making as organized crime;Tilly,1985