Natthapon Veerachalee, Pongpol Taweema and Apisit Songsasen (2007) “Complexation and Spectrophotometric Determination of Cobalt(II) Ion with 3-(2′-thiazolylazo)-2,6-diaminopyridine”, Agriculture and Natural Resources. Bangkok, Thailand, 41(4), pp. 675–680. available at: https://li01.tci-thaijo.org/index.php/anres/article/view/244308 (accessed: 2 September 2026).