Name	Info	Provider	Link
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:1780988
	subscription/membership/fee required	Silverchair Information Systems	https://academic.oup.com/trstmh/article-lookup/doi/10.1016/0035-9203(91)90364-5