Name	Info	Provider	Link
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S0378-1119(09)00580-0
Full text from	free resource	CORE	https://core.ac.uk/reader/20649630?utm_source=linkout
SILVA LSU Database	free resource	SILVA	http://www.arb-silva.de/search/show/lsu/pubid/20004236