Name	Info	Provider	Link
	subscription/membership/fee required	International Union of Crystallography	http://scripts.iucr.org/cgi-bin/paper?S2059798315024237
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/26894673/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/26894673
	free resource	scite Smart Citations	https://scite.ai/reports/26894673
Full text from	free resource	White Rose Research Online	https://eprints.whiterose.ac.uk/201218/