VAŇURA, P., MAKRLÍK, E., VOBECKÝ, M. Solvent extraction of strontium into nitrobenzene using hydrogen dicarbollylcobaltate in the presence of 12-crown-4. Journal of Radioanalytical and Nuclear Chemistry. 2003, 257(2), 437-440. ISSN 0236-5731. E-ISSN 1588-2780.