Jensen, David International Max Planck Research School on Retaliation, Mediation and Punishment, Max Planck Society; Criminology, Max Planck Institute for Foreign and International Criminal Law, Max Planck Society;
https://www.mpicc.de/files/pdf1/band_k_163_maras_jensen.pdf (Table of contents)
Jensen, D. (2013). Maras: A study of their origin, international impact, and the measures taken to fight them. Berlin: Duncker & Humblot.