Name	Info	Provider	Link
	subscription/membership/fee required	Springer	https://dx.doi.org/10.1007/s00792-013-0537-5
	free resource	scite Smart Citations	https://scite.ai/reports/23568449
SILVA SSU Database	free resource	SILVA	http://www.arb-silva.de/search/show/ssu/pubid/23568449