@article {2510,
	title = {The lichen genus Usnea in East Fennoscandia. III. The shrubby species},
	journal = {Annales Botanici Fennici},
	volume = {36},
	year = {1999},
	pages = {235-256},
	url = {http://www.sekj.org/PDF/anbf36/anbf36-235p.pdf},
	author = {Halonen, P. and Myllys, L. and Ahti, T. and Petrova, O.V.}
}
