Fiber introduction mass spectrometry: determination of pesticides in herbal infusions using a novel sol-gel PDMS/PVA fiber for solid-phase microextraction - Silva, Rogério Cesar da; Zuin, Vânia Gomes; Yariwake, Janete Harumi; Eberlin, Marcos Nogueira; Augusto, Fabio (Journal of Mass Spectrometry, 2007)