Spectrophotometric Determination of Concentrations of Co (II) and Ni (II) in Complex With 1- (2-Pirydylazo) -2-Naphthol in Aqueous Micellar Medium. Khark. Univ. Bull. Chem. Ser. 2014, No. 24, 153-160. https://doi.org/10.26565/2220-637X-2014-24-19.