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WORTBERG, J. Nuevos cabezales con distribuidor en espiral. Informador Técnico, [S. l.], v. 68, p. 15–21, 2004. DOI: 10.23850/22565035.808. Disponível em: https://revistas.sena.edu.co/index.php/inf_tec/article/view/808. Acesso em: 24 mar. 2026.