Name	Info	Provider	Link
	subscription/membership/fee required	Optica Publishing Group	https://opg.optica.org/abstract.cfm?URI=ao-43-8-1719
Full text from	free resource	CORE	https://core.ac.uk/reader/38181532?utm_source=linkout
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:15046176