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Nayak, A. N. and Ramappa, P. G. and Yathirajan, H. S. (1982) Determination of Phenothiazine-derivatives of Pharmaceutical importance by extraction Spectrophotometric method. Anales De Quimica Serie C-Quimica Organica Y Bioquimica, 72 (1). pp. 86-88.
Nayak, A. N. and Ramappa, P. G. and Yathirajan, H. S. and Manjappa, S. (1982) Microdetermination of niobium (V) with imipramine hydrochloride. Acta chimica Hungarica, 111 (2). pp. 233-238.
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 Ramappa, P. G. and Nayak, A. N. (1979) Rapid spectrophotometric determination of phenothiazines with molybdophosphoric acid. Analytica chimica acta, 108 (C). pp. 277-283. ISSN 0003-2670
Ramappa, P. G. and Sanke Gowda, H. and Nayak, A. N. (1979) Rapid spectrophotometric determination of phenothiazines with silicotungstic acid. Fresenius' zeitschrift für analytische chemie, 298 (2-3). p. 160. ISSN 0016-1152
