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Nejem, R’afat M. and Issa, Mahmoud M. and Abu Shanab, Alaa M. and Shaat, Nahed T. (2014) Simultaneous determination of quaternary mixture of sulfamethoxazole, trimethoprim, propylparaben and methylparaben in pharmaceutical formulations using mean centering of ratio spectra. Al-Aqsa University Journal (Natural Sciences Series), 18 (1). pp. 1-18. ISSN ISSN 2070-3155 (Print), ISSN 2521-893X (Online)