Piroskova, J., Trpcevska, J., Orac, D., Laubertova, M., Horvathova, H. and Holkova, B. 2018. Production of Zinc Oxide from Hazardous Waste – Sal Ammoniac Skimming. Journal of Mining and Metallurgy, Section B: Metallurgy. 54, 3 (Dec. 2018), 377.