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M. Taghizadeh, R. Ghasemzadeh, S.N Ashrafizadeh, K. Saberyan and M. Ghanadi Maragheh, Determination of optimum process conditions for the extraction and separation of zirconium and hafnium by solvent extraction, Hydrometallurgy, Vol. 90, No.2-4, 2008

B.R. Reddy, J.R. Kumar, Studies on liquid-liquid extraction of tetravalent hafnium from weakly hydrochloric acid solutions by LIX 84-IC., Separation and Purification Technology, Vol.42 No.2, 2005

B. Ramachandra Reddy, J. Rajesh Kumar, K. Phani Raja, A. Varada Reddy, Solvent extraction of Hf(IV) from acidic chloride solutions using Cyanex 302. Minerals Engineering, Vol.17 No.7-8, 2004

B.R. Reddy, J.R. Kumar, A.V. Reddy, Solvent extraction of tetravalent hafnium from acidic chloride solutions using 2-ethyl hexyl phosphonic acid mono-2-ethyl hexyl ester (PC-88A). Minerals Engineering, Vol.17 No.4, 2004

H.Y. Lee, S.G. Kim, J.K. Oh, Stoichiometric relation for extraction of zirconium and hafnium from acidic chloride solutions with Versatic Acid 10. Hydrometallurgy, Vol.73 No.1-2, 2004