@book {52,
	title = {The Lichen Genus Collema with Special Reference to the Extra-European Species},
	year = {1974},
	publisher = {ofters tryckeri ab, {\"O}stervala},
	organization = {ofters tryckeri ab, {\"O}stervala},
	address = {Stockholm},
	issn = {91-554-0250-x},
	author = {Degelius, Gunnar}
}
