Wayback Machine

Lifetime of white LEDs at the wayback machine. US Department of Energy... 

The references are divided into three categories. First are the traditional references to scientific and trade journals. Second, we have chosen to segregate the patents which are a component of the technical literature to be sure, but not motivated primarily by a desire to disseminate information and instruct, but by a desire to exploit the technology commercially. Many of the questions which naturally occur to the reader are left deliberately obscure in patent writing. Third, we include a category for links and personal communication which expands on the ephemeral conversations and letters which had traditionally been referenced to include online resources in the form of links which may or may not be viable for future readers. Online search makes it simple to track down persons who might be willing to confirm or discuss a personal communication Also, the internet archive (aka the Wayback Machine ) makes even expired links potentially viable. 

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See also in sourсe #XX -- [ ]

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