@article {49607,
	title = {Produced fluids and shallow groundwater in coalbed methane (CBM) producing regions of Alberta, Canada : trace element and rare earth element geochemistry},
	volume = {77},
	year = {2009},
	pages = {338-349},
	publisher = {International Journal of Coal Geology},
	author = {Ceung, Katrina and Sanei, Hamed and Klassen, Patrick and Mayer, Bernard and Goodarzi, Fariborz}
}
