Zhang, X.-H. and Chen, W.-B. (2013) “Tween-80 Medium-Spectrophotometric Determination of Trace Ge(IV) with 1-(4-Antipyrine)-3-(2,4,6-tribromo phenyl)triazene as Colour Reagent”, Asian Journal of Chemistry, 25(17), pp. 9805–9807. doi: 10.14233/ajchem.2013.15391.