Greene, O. & Penetrante, A.M. <https://pure.iiasa.ac.at/view/iiasa/2855.html>  (2011).  Arms, private militias and fragile state dynamics.    In:  Small Arms, Crime and Conflict. Eds. Greene, O. & Marsh, N., pp. 138-159 Taylor & Francis.  ISBN 978-020380603-6 10.4324/9780203806036 <https://doi.org/10.4324/9780203806036>.