Costa, Perla Alves Bento de Oliveira. “‘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, no. 1 (February 18, 2020): 156–171. Accessed November 23, 2024. https://revista.forumseguranca.org.br/rbsp/article/view/1073.