Name	Info	Provider	Link
	subscription/membership/fee required	Cambridge University Press	https://www.cambridge.org/core/product/identifier/S0031182009991053/type/journal_article
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:19765336
SILVA SSU Database	free resource	SILVA	http://www.arb-silva.de/search/show/ssu/pubid/19765336