L. Morgan and P. Finnegan, Benefits and Drawbacks of Open Source Software: an Exploratory Study of Secondary Software Firms, in IFIP Open Source Development, Adoption and Innovation, pp.307-312, 2007.

P. J. Ågerfalk, A. Deverell, A. Fitzgerald, M. , and L. , Assessing the Role of Open Source Software in the European Secondary Software Sector: A Voice from Industry, First International Conference on Open Source Systems (OSS2005), pp.82-87, 2005.

J. Hardy and M. Bourgois, Exploring the potential of OSS in Air Traffic Management, Open Source Systems, vol.203, pp.173-179, 2006.
DOI : 10.1007/0-387-34226-5_17

F. Eurocontrol, Europe Comparison of ATM-related Operational Performance, 2009.

H. Dumez and A. Jeunemaître, Restructuring Regulation in Europe. The Case of Air Traffic Services. » Concurrences, n°1, pp.1-3, 2008.
URL : https://hal.archives-ouvertes.fr/hal-00263367

R. A. Ghosh, Free Software: How Does it Work, European Broadcasting Union Seminar, 2007.

G. A. Miller, The magical number seven, plus or minus two: some limits on our capacity for processing information., Psychological Review, vol.63, issue.2, pp.81-97, 1956.
DOI : 10.1037/h0043158

F. Van-der-linden, B. Lundell, and P. Marttiin, Commodification of Industrial Software: A Case for Open Source, IEEE Software, vol.26, issue.4, pp.77-83, 2009.
DOI : 10.1109/MS.2009.88