Melquiades, R. A., I. Lobo, C. L. B. Guedes, and J. P. Pinto. “Analysis of Benzene, Toluene, Ethylbenzene and Xylenes in Soils by Headspace and Gas chromatography/Flame Ionization Detector”. Semina: Ciências Exatas E Tecnológicas, vol. 27, no. 2, Dec. 2006, pp. 113-20, doi:10.5433/1679-0375.2006v27n2p113.