Heterogeneous friendship affiliation, problem behaviors, and emotional outcomes among high-risk adolescents
Prevention Science (2012) - Comment
pubmed: 22207411  doi: 10.1007/s11121-011-0261-2  issn: 1573-6695  issn: 1389-4986 

Melanie J. Richmond, Robin J. Mermelstein, Aaron Metzger