Name	Info	Provider	Link
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S0981-9428(10)00185-3
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:20951599
SILVA SSU Database	free resource	SILVA	http://www.arb-silva.de/search/show/ssu/pubid/20951599