Yurchenko, O. I., Osipov, A. V., Dobriyan, M. A. and Chernozhuk, T. V. (2014) “Validation of the method of spectrophotometric determination of nicotinic acid in preparations”, Kharkiv University Bulletin. Chemical Series, 0(24), pp. 140-144. doi: 10.26565/2220-637X-2014-24-17.