ZALOV, A. Z.; AMANULLAYEVA, G. I. SPECTROPHOTOMETRIC DETERMINATION OF COBALT (II) IN A LIQUID-LIQUID EXTRACTION SYSTEM CONTAINING 2- HYDROXY-5-IODOTHIOPHENOL AND DIPHENYLGUANIDINE. IJRDO-Journal of Applied Science, v. 2, n. 7, p. 17-25, 31 Jul. 2016.