S. Byrd, Cost/benefit analysis for digital library projects: the Virginia Historical Inventory Project (VHI)'. The Bottom Line: Managing Library Finances, pp.65-75, 2001.

S. Chapman and S. Granger, Counting the Costs of Digital Preservation: Is Repository Storage AffordableCost Elements of Digital Preservation, Journal of Digital Information, vol.4, issue.2, pp.208-214, 2000.

S. Harnad, The Access/Impact Problem and the Green and Gold Roads to Open Access: An Update, Serials Review, vol.17, issue.3, pp.36-40, 2008.
DOI : 10.1080/00987913.2008.10765150

S. Harnad, Open Access Repositories -maximizing and measuring research impact through university and research-funder open-access self-archiving mandates, pp.36-41, 2009.

M. Heaney, Library statistics for the twenty -first century world, Montré al on 18-19 August 2008 reporting on the Global Library Statistics Project. K.G. Saur, 2009.
DOI : 10.1515/9783598441677

L. Horwood, Institutional Repositories: Content and Culture in an Open Access EnvironmentInstitutional repositories: review and an information systems perspectiveAre libraries dead?'. In Ressources électroniques académiques: mesures et usagesCost-benefit analysis: a disparagement of its misuse and misexplanation'. The Bottom Line: Managing Library FinancesOATAO Archive ouverte multi-établissements. Bilan après un an d'existence', The New Frontier of Institutional Repositories Three Different Libraries, Three Different Plans, One Common Goal. CNI Fall 2003 Project Briefing Monday December 8The situation of open access institutional repositories in Spain: 2009 report'. Information Research, pp.170-176236, 2003.

F. Merceur, Gestion d'une archive et d'un moissonneur, l'exemple de l'IFREMER'The Digital Preservation of e-Prints, 2003.

M. Piorun and &. L. Palmer, Digitizing Dissertations for an Institutional Repository: A Process and Cost Analysis, Journal of the Medical Library Association : JMLA, vol.96, issue.3, pp.223-229, 2008.
DOI : 10.3163/1536-5050.96.3.008

J. Salaün, Demand for Scientific Articles and Citations: An Example from the Institut de l'information scientifique et technique (France, Scientometrics, vol.47, issue.3, pp.561-588, 2000.
DOI : 10.1023/A:1005676002052

J. Schöpfel, Usage of grey literature in open archives The Grey Mosaic: Piecing It All TogetherDocument supply of grey literature and open access: an update', GL11 Conference Proceedings. Eleventh International Conference on Grey Literature, pp.14-15181, 2009.

P. Shepherd, COUNTER 2005: a new Code of Practice and new applications of COUNTER usage statistics, The Value Gap'. Library Journal, pp.287-293, 2005.
DOI : 10.1087/095315105774648762

J. Willinsky, The Access Principle: The Case for Open Access to Research and Scholarship (Digital Libraries and Electronic Publishing), 2005.