Silva, A.A.R. da, Lobo, I., Guedes, C.L.B. and Pinto, J.P. 2006. Analysis of Polycyclic Aromatic Hydrocarbons (PAHs) in soils using ultrasonic agitation, heater/mini condenser tube and gaseous chromatography. Semina: Ciências Exatas e Tecnológicas. 27, 2 (Dec. 2006), 105–112. DOI:https://doi.org/10.5433/1679-0375.2006v27n2p105.