Comparative Study Between Zero-Order Spectra-Processing and Ratio Spectra-Manipulating Methods Applied for the Determination of Isoxsuprine Hydrochloride in the Presence of Its Oxidative Degradation Product. - ATTIA, KHALID A. M.; EL-ABASSAWI, NASR M. A.; SAID, RAGAB A. M.; EL-OLEMY, AHMED; RAMZY, SHERIF (Journal of AOAC International, 2017)