Name	Info	Provider	Link
	subscription/membership/fee required	American Chemical Society	https://doi.org/10.1021/nl1022699
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20939507/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/20939507