Reversed flow-injection manifold for the spectrophotometric determination of captopril based on its inhibitory effect on the Co (II)–2, 2′-dipyridyl-2-pyridylhydrazone complex formation - Tzanavaras, Paraskevas D; Themelis, Demetrius G; Economou, Anastasios; Theodoridis, Georgios (TalantaTALANTA, 2002)