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Keshavan, B. and Prasad, K. P. K. (1992) Extraction and spectrophotometric determination of niobium. Journal of the Indian Chemical Society, 69 (2). pp. 112-113. ISSN 0019-4522
Keshavan, B. and Prasad, K. P. K. (1992) Extractive spectrophotometric determination of tantalum(V) with mepazine hydrochloride. Journal of the Indian Chemical Society, 69 (2). pp. 113-114.
Keshavan, B. and Prasad, K. P. K. (1992) Extractive spectrophotometric determination of uranium(VI) with pyrogallol and chlorpromazine hydrochloride. Journal of the Indian Chemical Society, 69 (12). pp. 895-896. ISSN 0019-4522
Keshavan, B. and Prasad, K. P. K. (1991) Extraction and Spectrophotometric Determination of Titanium In Minerals and Alloys. Journal of the Indian Chemical Society, 68 (2). pp. 117-118.