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Vinay, K. B. and Revannasiddappa, H. D. and Rajendraprasad, N. and Ramesh, P. J. and Xavier, C. M. and Basavaiah, K. (2012) Use of two sulfonthalein dyes in the extraction-free spectrophotometric assay of tramadol in dosage forms and in spiked human urine based on ion-pair reaction. Drug Testing and Analysis, 4 (2). pp. 116-122. ISSN 1942-7611