Alessandro Cucchiarelli Paola Velardi Fulvio D'Antonio Mirco Curzi Modeling Collaborations Content in Social Network Analysis. 188-191 2008 Web Intelligence http://dx.doi.org/10.1109/WIIAT.2008.119 conf/webi/2008 db/conf/webi/webi2008.html#CucchiarelliVDC08