1. The Extraction of Niobium, Tantalum and other Elements from Fluoride Solutions;Babkin,1988
2. Hydrometallurgical extraction of tantalum and niobium in China;He;Bulletin,1998
3. Tantalum in Russia: state of the art, outlooks for development of the mineral raw material base;Kudrin,1999
4. Solvent extraction of niobium(V) and tantalum(V) from fluorometallate acid solutions;Mayorov;Hydrometallurgy,1996
5. Tantalum and niobium extraction by octanol from fluoride–titanium solutions;Mayorov,1998