1. US Environmental Protection Agency: ‘Summary of factors affecting compliance by ferrous foundries’, Vol. 1, EPA-340/1-80-020, 34-49; 1981, Washington, DC, EPA.
2. US Environmental Protection Agency: ‘Profile of the metal casting industry’, EPA/310/R-97/004, 15-22, 77-84; 1997, Washington, DC, EPA.
3. US Environmental Protection Agency: ‘Guides to Pollution Prevention, Metal Casting and Heat Treating Industry’, EPA/625/R-92/009, 5-12; 1992, Washington, DC, EPA.
4. M. C. Zanetti, S. Fiore and C. Clerici: Proc. XXII Int. Mineral Processing Cong., Cape Town, South Africa, September 2003, University of Cape Town, 1836-1844.