LEINONEN, J. I. Superior Properties of Ultra-fine-grained Steels. Acta Polytechnica, [S. l.], v. 44, n. 3, 2004. DOI: 10.14311/572. Disponível em: https://ojst.is.cvut.cz/ojs/index.php/ap/article/view/572.. Acesso em: 28 jun. 2025.