SIKORA, Mirosław. Informational Support of Civilian Intelligence for Heavy Industry (Including Machine Industry) and the Energy Sector in the Polish People’s Republic in the Years 1970–1990. Studia Historiae Oeconomicae, [S. l.], v. 36, p. 143–173, 2018. DOI: 10.2478/sho-2018-0009. Disponível em: https://pressto.amu.edu.pl/index.php/sho/article/view/29098. Acesso em: 11 dec. 2025.