Name	Info	Provider	Link
	subscription/membership/fee required	Optica Publishing Group	https://opg.optica.org/abstract.cfm?URI=ao-56-10-2661
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:28375226
	free resource	scite Smart Citations	https://scite.ai/reports/28375226