1. Boer, P., Huisman, M., Snijders, T.A.B., Wichers, L.H.Y., Zeggelink, E., 2006. StOCNET: an open software system for the advanced analysis of social networks. Version 1.7. ICS/Science Plus, Groningen.
2. UCINET 5 for Windows: Software for Social Network Analysis;Borgatti,1999
3. Memory Structures for Relational Data in R: Classes and Interfaces Working Paper;Butts,2002
4. The Network Package. Manual;Butts,2005
5. Statistical analysis of change in networks;Frank;Statistica Neerlandica,1991