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© 2009 Elsevier BV. This is the post print version of the following article: Komulainen, Tiina & Doyle III, Francis J. & Rantala, Ari & Jämsä-Jounela, Sirkka-Liisa. 2009. Control of an industrial copper solvent extraction process. Journal of Process Control. Volume 19, Issue 1. 19. ISSN 0959-1524 (printed). DOI: 10.1016/j.jprocont.2008.04.019, which has been published in final form at http://www.sciencedirect.com/science/article/pii/S0959152408000620.