Costa, Perla Alves Bento de Oliveira. 2020. “‘You Have to Approach It to Get to Know it’ - the Birth of the X-9: An Investigation Tool Used by the Military Police of the State of Rio De Janeiro”. Revista Brasileira De Segurança Pública 14 (1):156-71. https://doi.org/10.31060/rbsp.2020.v14.n1.1073.