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Krichel, Thomas, (1999) “Guildford protocol”, available at ftp://netec.mcc.ac.uk/pub/NetEc/RePEc/all/root/docu/guilp.html

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Krichel, Thomas and Michael E.D. Koenig, (2004) “From Open Access to Open Libraries: Claims and Visions for Open Academic Libraries”, presented at the second China Digital Libraries conference, Beijing, China, September 6 to 8.