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De Crom J, Claeys S, Godayol A, Alonso M, Anticó E, Sanchez JM. Sorbent‐packed needle microextraction trap for benzene, toluene, ethylbenzene, and xylenes determination in aqueous samples. J of Separation Science. 2010 Aug 20;33(17-18):2833–40. doi: 10.1002/jssc.201000213. |