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	subscription/membership/fee required	Wiley	https://onlinelibrary.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=0378-1097&date=1992&volume=76&issue=1-2&spage=57
	subscription/membership/fee required	Silverchair Information Systems	https://academic.oup.com/femsle/article-lookup/doi/10.1016/0378-1097(92)90363-s