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Hawari, J., Beaulieu, C., Ouellette, D., Pontbriand, Y., Halasz, A. M., & Tra, H. V. (1994, May). Determination of Petroleum Hydrocarbons in Soil: SFE versus Soxhlet and Water Effect on Recovery [Paper]. 24th International Symposium on Environmental Analytical Chemistry, Ottawa, Ont.. Published in International Journal of Environmental Analytical Chemistry, 60(2-4). External link