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Patryk Oleszczuk; Stanisław Baran. (2004). Application of solid-phase extraction to determination of polycyclic aromatic hydrocarbons in sewage sludge extracts. , 113(1-3), 237–245. doi:10.1016/j.jhazmat.2004.06.015 
10.1016/j.jhazmat.2004.06.015