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Nayak, A. N. and Ramappa, P. G. and Yathirajan, H. S. and Subrahmanya, U. (1981) Extractive Spectrophotometric Determination of N-Substituted Phenothiazines In Pharmaceutical Preparations With Alizarin Red-S. Annali Di Chimica, 71 (11). pp. 721-727.
Sanke Gowda, H. and Shakunthala, R. and Subrahmanya, U. (1980) Redox indicators in titrations with dichloramine-B. Talanta, 27 (Copyri). p. 1081.
Sanke Gowda, H. and Shakunthala, R. and Subrahmanya, U. (1979) Naphthidines and O-dianisidine as redox indicators in titrations with n-bromosuccinimide. The analyst, 104 (1242). pp. 865-872. ISSN 0003-2654