Dissipation of Organophosphorus Pesticides in Green Onion ( Allium fistulosum L), Cultivated in Forced System Called “Barbacoas”. - Ettiene, G.; Ortega, S.; Sepúlveda, J.; Medina, D.; Buscema, I.; Sandoval, L. (Bulletin of Environmental Contamination & Toxicology, 2006)