@article {40843,
	title = {Carbon isotope composition of boreal plants: functional grouping of life forms},
	volume = {110},
	year = {1997},
	pages = {301-311},
	publisher = {Oecologia},
	author = {Brooks, J. R. and Flanagan, L. B. and Buchmann, N. and Ehleringer, J. R.}
}
