@article {1552,
	title = {Quantifying nitrogen fixation in feather bryophyte carpets of boreal forests.},
	journal = {Nature},
	volume = {419},
	year = {2002},
	pages = {917-920},
	author = {DeLuca, T.H. and Zackrisson, O. and Nilsson, M.C. and Sellstedt, A.}
}
