Richardson M.; Saxby C. OUP contribution to thew Nature debate on Open Access from 8.4.2004 at http://www.nature.com/nature/focus/accessdebate/12.html, accessed 30. April 2004.

Costs and business models in scientific research publishing, Report by the Wellcome Trust, 2004 http://www.wellcome.ac.uk/en/images/costs_business_7955.pdf, accessed 30 April 2004.

Steve Hitchcock et al, 2002 "Open Citation Linking: The Way Forward",  D-Lib Magazine October 2002 volume 8, number 10 and at    http://opcit.eprints.org/dl00/dl00.html/, accessed 30 April 2004.

Lesk, M (1997) Practical Digital Libraries : Books, Bytes, and Bucks; Lesk, M; Morgan Kauffman