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https://web.archive.org/web/20020325012704/http://freenetworks.org/
https://www.metamute.org/editorial/articles/libre-non-gratis-berlon
https://www.metamute.org/editorial/articles/copenhagen-interpolation
https://web.archive.org/web/20040928074104/http://guerrilla.net/gnet_2_4ghz.html