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Hi Mohammed.

Please have a look at:
 Basic notions for the analysis of large two-mode networks.
 Matthieu Latapy, Clémence Magnien, Nathalie Del Vecchio.
 Social Networks 30(1): 31-48 (2008)

You may find several references of interest to your work in there.

Best regards,

Matthieu Latapy

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