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HUGHES, J. E. Cifrados de barras en la industria. Informador Técnico, [S. l.], v. 30, p. 2–5, 1987. DOI: 10.23850/22565035.1271. Disponível em: https://revistas.sena.edu.co/index.php/inf_tec/article/view/1271. Acesso em: 24 mar. 2026.