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	1.	Determination of triphenylphosphine oxide in active pharmaceutical ingredients by hollow-fiber liquid-phase microextraction followed by reversed-phase liquid chromatography. [electronic resource] by Richoll, Stephen M Colón, Ivelisse Producer: 20061012 In: Journal of chromatography. A vol. 1127 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	2.	Determination of methyl and ethyl esters of methanesulfonic, benzenesulfonic and p-toluenesulfonic acids in active pharmaceutical ingredients by solid-phase microextraction (SPME) coupled to GC/SIM-MS. [electronic resource] by Colón, Ivelisse Richoll, Stephen M Producer: 20060106 In: Journal of pharmaceutical and biomedical analysis vol. 39 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)

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