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Naphthenic acids in groundwater overlying undeveloped shale gas and tight oil reservoirs; Ahad, J M E; Pakdel, H; Lavoie, D;
Lefebvre, R; Peru, K; Headley, J V. Chemosphere vol. 191, 2018 p. 664-672,
https://doi.org/10.1016/j.chemosphere.2017.10.015 
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