TY - SER AU - Lozano,Ana TI - Pesticide analysis in teas and chamomile by liquid chromatography and gas chromatography tandem mass spectrometry using a modified QuEChERS method: validation and pilot survey in real samples N1 - YA2013 M04 Sources - Journal of Chromatography A Sources - 1268 (December) 2012 : 109-122 ISSN - 0021-9673 ER -