1. Lead and Zinc Statistics, Monthly Bulletin of the ILZSG 44(2) (2004); 45 (2) (2005); 47 (10) (2007).
2. A. V. Tarasov, A. D. Besser, V. I. Mal’tsev, and V. S. Sorokina, Metallurgical Processing of Secondary Lead Raw Materials, Ed. by A. V. Tarasov (Gintsvetmet, Moscow, 2003) [in Russian].
3. World Metal Statistics, No. 6, (1988).
4. Lead and Zinc in Batteries (ILZSG, London, 2003).
5. A. Siegmund, in Proceedings of the Conference Lead-Zinc’2000 (The Minerals, Metals, and Materials Society, Warrendale, 2000), p. 55.