Name	Info	Provider	Link
	subscription/membership/fee required	International Union of Crystallography	http://scripts.iucr.org/cgi-bin/paper?cv5381
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23424529/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/23424529
	free resource	scite Smart Citations	https://scite.ai/reports/23424529