SADDEEK, Y. B.; AZOOZ, M. A.; KENAWY, S. H. Effect of fly ash on the Li2O-B2O3 system: structural study by pulse echo technique. Archives of Acoustics, [S. l.], v. 30, n. 3, 2005. Disponível em: http://acoustics.ippt.gov.pl/index.php/aa/article/view/523. Acesso em: 18 apr. 2026.