M. E. Newman, Networks: An Introduction, 2010.
DOI : 10.1093/acprof:oso/9780199206650.001.0001

F. Radicchi, C. Castellano, F. Cecconi, V. Loreto, and D. Parisi, Defining and identifying communities in networks, Proceedings of the National Academy of Sciences, vol.68, issue.4, 2004.
DOI : 10.1093/bioinformatics/btg033
URL : http://www.ncbi.nlm.nih.gov/pmc/articles/PMC365677

K. Musia?l and P. Kazienko, Social networks on the internet, World Wide Web, vol.1, pp.1-42, 2012.

L. Costa, F. Rodrigues, G. Travieso, and P. Boas, Characterization of complex networks: A survey of measurements, Advances in Physics, vol.14, issue.1, pp.167-242, 2007.
DOI : 10.1073/pnas.172501399

H. Bisgin, N. Agarwal, and X. Xu, Investigating Homophily in Online Social Networks, 2010 IEEE/WIC/ACM International Conference on Web Intelligence and Intelligent Agent Technology, pp.533-536, 2010.
DOI : 10.1109/WI-IAT.2010.61

M. S. Granovetter, The Strength of Weak Ties, American Journal of Sociology, vol.78, issue.6, pp.1360-1380, 1973.
DOI : 10.1086/225469

L. C. Freeman, Centrality in social networks conceptual clarification, Social Networks, vol.1, issue.3, pp.215-239, 1979.
DOI : 10.1016/0378-8733(78)90021-7
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.227.9549

L. Garton, C. Haythornthwaite, and B. Wellman, Studying Online Social Networks, Journal of Computer-Mediated Communication, vol.81, issue.2, pp.0-0, 1997.
DOI : 10.1111/j.1083-6101.1997.tb00062.x

P. Kazienko, K. Musial, E. Kukla, T. Kajdanowicz, and P. Bródka, Multidimensional Social Network: Model and Analysis, LNAI, vol.6922, pp.378-387, 2011.
DOI : 10.1007/978-3-642-23935-9_37

D. Knoke and S. Yang, Social network analysis, of Quantitative applications in the social sciences, 2008.
DOI : 10.4135/9781412985864

D. Knoke and S. Yang, Social Network Analysis, 2008.
DOI : 10.4135/9781412985864

G. Sabidussi, The centrality index of a graph, Psychometrika, vol.24, issue.66, pp.581-603, 1966.
DOI : 10.1007/BF02289527

M. Newman, A. L. Barabasi, and D. J. Watts, The Structure and Dynamics of Networks: (Princeton Studies in Complexity), 2006.

M. Girvan and M. E. Newman, Community structure in social and biological networks, Proceedings of the National Academy of Sciences, vol.139, issue.21, pp.7821-7826, 2002.
DOI : 10.1103/PhysRevLett.85.4633
URL : http://www.ncbi.nlm.nih.gov/pmc/articles/PMC122977

M. E. Newman and M. Girvan, Finding and evaluating community structure in networks, Physical Review E, vol.69, issue.2, p.16, 2004.
DOI : 10.1103/PhysRevE.69.026113
URL : http://arxiv.org/abs/cond-mat/0308217

A. Pothen, H. D. Simon, and K. P. Liou, Partitioning Sparse Matrices with Eigenvectors of Graphs, SIAM Journal on Matrix Analysis and Applications, vol.11, issue.3, pp.430-452, 1990.
DOI : 10.1137/0611030

M. Fiedler, Algebraic connectivity of graphs, Czechoslovak Mathematical Journal, vol.23, pp.298-305, 1973.

P. Drázdilová, J. Martinovic, and K. Slaninová, Spectral clustering: Left-right-oscillate algorithm for detecting communities, In: ADBIS Workshops, pp.285-294, 2012.

S. E. Dreyfus and H. L. Dreyfus, A five-stage model of the mental activities involved in directed skill acquisition, 1980.

M. R. Ennis, Competency models: a review of the literature and the role of the employment and training administration (ETA), 2008.

G. Sinnott, G. Madison, and G. Pataki, Competencies: Report of the competencies workgroup, workforce and succession planning work groups, 2002.

M. W. Berry, Survey of text mining: clustering, classification, and retrieval, 2004.
DOI : 10.1007/978-1-4757-4305-0

S. Kuchar and J. Martinovic, Human Resource Allocation in Process Simulations Based on Competency Vectors, AISC of Advances in Intelligent Systems and Computing, 2013.
DOI : 10.1007/978-3-642-32922-7_24

E. L. Fitzpatrick and R. G. Askin, Forming effective worker teams with multi-functional skill requirements, Computers & Industrial Engineering, vol.48, issue.3, pp.593-608, 2005.
DOI : 10.1016/j.cie.2004.12.014

A. Karduck and A. Sienou, Forming the Optimal Team of Experts for Collaborative Work, Artificial Intelligence Applications and Innovations, IFIP 18th World Computer Congress, TC12 First International Conference on Artificial Intelligence Applications and Innovations, pp.22-27, 2004.
DOI : 10.1007/1-4020-8151-0_24

H. Wi, S. Oh, J. Mun, and M. Jung, A team formation model based on knowledge and collaboration, Expert Systems with Applications, vol.36, issue.5, pp.9121-9134, 2009.
DOI : 10.1016/j.eswa.2008.12.031