%0 Journal Article %A Hummell, Hans J. %A Sodeur, Wolfgang %T Structural analysis of social networks with respect to different levels of aggregation %J Mathématiques informatique et sciences humaines %D 1997 %P 37-60 %V 137 %I Ecole des hautes-études en sciences sociales %U http://www.numdam.org/item/MSH_1997__137__37_0/ %G en %F MSH_1997__137__37_0