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Sanke Gowda, H. and Shakunthala, R. (1978) 3,3′-Dimethylnaphthidinedisulphonic acid as a selective and sensitive reagent for the spectrophotometric determination of vanadium(V) and its application to vanadium-bearing minerals and alloys. The Analyst, 103 (1233). pp. 1215-1220.