Drozd, A. V., and N. A. Leonova. “Spectrophotometric Determination of Soluble Complexes With 1-(2-Pyridylazo)-2-Naphthol in Water at Different PH”. Kharkiv University Bulletin. Chemical Series, no. 21, Dec. 2012, pp. 218-23, doi:10.26565/2220-637X-2012-21-21.