R. Albert and A. L. Barabási, Statistical mechanics of complex networks, Reviews of Modern Physics, vol.74, issue.1, pp.47-97, 2002.
DOI : 10.1103/RevModPhys.74.47

A. L. Barabási, Scale-Free Networks: A Decade and Beyond, Science, vol.325, issue.5939, pp.412-415, 2009.
DOI : 10.1126/science.1173299

C. Bird, A. Goey, P. Devanbu, A. Swaminathan, and G. Hsu, Open Borders? Immigration in Open Source Projects, Fourth International Workshop on Mining Software Repositories (MSR'07:ICSE Workshops 2007), 2007.
DOI : 10.1109/MSR.2007.23

R. Burt, Structural Holes: The Social Structure of Competition

A. Capiluppi, P. Lago, and M. Morisio, Characteristics of open source projects, Seventh European Conference onSoftware Maintenance and Reengineering, 2003. Proceedings., p.317, 2003.
DOI : 10.1109/CSMR.2003.1192440

K. Crowston and J. Howison, The social structure of free and open source software development, First Monday, vol.10, issue.2
DOI : 10.5210/fm.v10i2.1207

G. Csardi and T. Nepusz, The igraph software package for complex network research, InterJournal Complex Systems, p.1695, 2006.

D. M. Germán, The GNOME project: a case study of open source, global software development, Software Process: Improvement and Practice, pp.201-215, 2004.
DOI : 10.1002/spip.189

V. Gilsing, B. Nooteboom, W. Vanhaverbeke, G. Duysters, and A. V. Oord, Network embeddedness and the exploration of novel technologies: Technological distance, betweenness centrality and density, Research Policy, vol.37, issue.10, pp.1717-1731, 2008.
DOI : 10.1016/j.respol.2008.08.010

J. M. González-barahona, G. Robles, R. Andradas-izquierdo, and R. A. Ghosh, Geographic origin of libre software developers, Information Economics and Policy, vol.20, issue.4, pp.356-363, 2008.
DOI : 10.1016/j.infoecopol.2008.07.001

E. Von-hippel and G. Von-krogh, Open Source Software and the 'Private-Collective' Innovation Model: Issues for Organization Science, SSRN Electronic Journal, vol.14, issue.2, pp.209-223, 2003.
DOI : 10.2139/ssrn.1410789

J. Howison, K. Inoue, and K. Crowston, Social dynamics of free and open source team communications, Proceedings of the IFIP Second International Conference on Open Source Software (Lake Como, Italy). IFIP International Federation for Information Processing, pp.319-330, 2006.
DOI : 10.1007/0-387-34226-5_32

G. Von-krogh and E. Von-hippel, The Promise of Research on Open Source Software, Management Science, vol.52, issue.7, pp.975-983, 2006.
DOI : 10.1287/mnsc.1060.0560

K. Laursen and A. Salter, Open for innovation: the role of openness in explaining innovation performance among U.K. manufacturing firms, Strategic Management Journal, vol.88, issue.2, pp.131-150, 2006.
DOI : 10.1002/smj.507

E. P. Lazear, Globalisation and the Market for Team-Mates, The Economic Journal, vol.109, issue.454, pp.15-40, 1999.
DOI : 10.1111/1468-0297.00414

J. Lerner and J. Tirole, The Scope of Open Source Licensing, Journal of Law, Economics, and Organization, vol.21, issue.1, pp.20-56, 2005.
DOI : 10.1093/jleo/ewi002

Y. Long and K. Siau, Social Network Structures in Open Source Software Development Teams, Journal of Database Management, vol.18, issue.2, pp.25-40, 2007.
DOI : 10.4018/jdm.2007040102

L. López-fernández, G. Robles, J. M. González-barahona, and I. Herraiz, Applying Social Network Analysis Techniques to Community-Driven Libre Software Projects, International Journal of Information Technology and Web Engineering, vol.1, issue.3, pp.27-48, 2006.
DOI : 10.4018/jitwe.2006070103

G. Madey, V. Freeh, and R. Tynan, Modeling the free/open source software community: A quantitative investigation, Free/Open Source Software Development, pp.203-220, 2005.

V. Mayer-schönberger, Can We Reinvent the Internet?, Science, vol.325, issue.5939, pp.396-403, 2009.
DOI : 10.1126/science.1178418

A. Mockus, R. T. Fielding, and J. D. Herbsleb, Two case studies of open source software development: Apache and Mozilla, ACM Transactions on Software Engineering and Methodology, vol.11, issue.3, 2002.
DOI : 10.1145/567793.567795

J. Y. Moon and L. S. Sproull, Essence of distributed work: The case of the Linux kernel, First Monday, vol.5, issue.11, 2000.
DOI : 10.5210/fm.v5i11.801

M. E. Newman and M. Girvan, Finding and evaluating community structure in networks, Physical Review E, vol.69, issue.2, p.26113, 2004.
DOI : 10.1103/PhysRevE.69.026113

P. Pons and M. Latapy, Computing Communities in Large Networks Using Random Walks, Journal of Graph Algorithms and Applications, vol.10, issue.2, pp.191-218, 2006.
DOI : 10.7155/jgaa.00124

G. Robles and J. M. González-barahona, Developer identification methods for integrated data from various sources, Proceedings of the 2005 international workshop on Mining software repositories, 2005.

S. K. Shah, Motivation, Governance, and the Viability of Hybrid Forms in Open Source Software Development, Management Science, vol.52, issue.7, pp.1000-1014, 2006.
DOI : 10.1287/mnsc.1060.0553

M. Shaikh and T. Cornford, Version Control Tools: A Collaborative Vehicle for Learning in F/OS In: Collaboration, Conflict and Control: The 4th Workshop on Open Source Software Engineering, 2004.

M. Van-antwerp and G. Madey, Advances in the SourceForge Research Data Archive (SRDA), paper presented at the, IFIP 2.13. In: Fourth International Conference on Open Source Systems, 2008.

S. Wasserman and K. Faust, Social Network Analysis: Methods and Applications, 1994.
DOI : 10.1017/CBO9780511815478

D. J. Watts and S. H. Strogatz, Collective dynamics of 'small-world' networks, Nature, vol.393, issue.6684, pp.440-442, 1998.
DOI : 10.1038/30918

A. Wiggins, J. Howison, and K. Crowston, Social Dynamics of FLOSS Team Communication Across Channels, Proceedings of the Fourth International Conference on Open Source Software, 2008.
DOI : 10.1007/978-0-387-09684-1_11

J. Xu, Y. Gao, S. Christley, and G. Madey, A Topological Analysis of the Open Souce Software Development Community, Proceedings of the 38th Annual Hawaii International Conference on System Sciences, 2005.