TAHIR, T. F.; AZIZ, K. F.; KOKHASMAIL , D. M. Natural Dye of Beetroot: An Agent for Spectrophotometric Determination of Atenolol in the Pharmaceutical Formulations. ARO-THE SCIENTIFIC JOURNAL OF KOYA UNIVERSITY, v. 11, n. 2, p. 59-64, 18 Sep. 2023.