Name	Info	Provider	Link
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S0025-326X(09)00136-2
Full text from	free resource	CORE	https://core.ac.uk/reader/41346520?utm_source=linkout
SILVA SSU Database	free resource	SILVA	http://www.arb-silva.de/search/show/ssu/pubid/19409577