Doreian, P., Batagelj, V. & Ferligoj, A. (1994). Partitioning networks based on generalized concepts of equivalence. Journal of Mathematical Sociology, 19(1), 1-27.
Hansen, K. et al. (2016). Rgraphviz: Provides plotting capabilities for R graph objects. R package version 2.16.0 available at: https://www.bioconductor.org/packages/release/bioc/html/Rgraphviz.html
Ostoic, J.A.R. (2018b). multigraph: Plot and Manipulate Multigraphs. R package version 0.75 available at: https://CRAN.R-Project.org/package=multigraph
Ostoic, J.A.R. (2018c). multiplex: Algebraic tools for the analysis of multiple social networks. R package version 2.8 available at: https://CRAN.R-Project.org/package=multiplex
Wasserman, S. & Faust, K. (1994). Social Network Analysis: Methods and Applications. Structural Analysis in the Social Sciences. Cambridge: Cambridge University Press.