Reference:
 -  Title: Blockmodeling of multilevel networks
    Journal: Social Networks
    Volume: 39
    Pages: 46 - 61
    Year: 2014
    ISSN: 0378-8733
    DOI: 10.1016/j.socnet.2014.04.002
    URL: http://www.sciencedirect.com/science/article/pii/S0378873314000306
    Eprint: http://arxiv.org/pdf/1405.5978
    Author: Aleš Žiberna
 -  Title: Direct and Indirect Approaches to Blockmodeling of Valued Networks in Terms of Regular Equivalence
    Author: Aleš Žiberna
    Journal: The Journal of Mathematical Sociology
    Volume: 32
    Number: 1
    Pages: 57-84
    Year : 2008
    Publisher: Routledge
    DOI: 10.1080/00222500701790207
    URL: https://www.tandfonline.com/doi/abs/10.1080/00222500701790207
    Eprint: http://eclectic.ss.uci.edu/~drwhite/pw/Ziberna-RegularEquivalence.pdf
 -  Title: Generalized blockmodeling of valued networks
    Journal: Social Networks
    Volume: 29
    Number: 1
    Pages: 105 - 126
    Year: 2007
    ISSN: 0378-8733
    DOI: 10.1016/j.socnet.2006.04.002
    URL: http://www.sciencedirect.com/science/article/pii/S037887330600013X
    Author: Aleš Žiberna
    Eprint: http://eclectic.ss.uci.edu/~drwhite/pw/Ziberna2007GeneralizedBlockmodeling.pdf
