00333nam a2200133 a 450000500170000002000150001708200160003210000180004824500320006626000230009830000250012149000360014670000170018220251203110321.0  a0761956042  a300.72bDEG  aDegenne,Alain  aIntroducing social networks  aLondonbSagec1999  avi,248p.c22cm.bPB.  aIntroducing statistical methods  aForse,Michel