HOURELD, W.; LEGGE, N. Vermindering van rookuitlating in siersteenproduksie - suksesvol gedemonstreer, en gebaseer op bekende maar half-vergete beginsels. Clean Air Journal, [S. l.], v. 1, n. 02, p. 5–10, 1972. DOI: 10.17159/caj/1972/1/02.7396. Disponível em: https://cleanairjournal.org.za/article/view/7396. Acesso em: 17 may. 2024.