Lomi, Alessandro, Snijders, Tom A.B., Steglich, Christian E.G. and Torlo, Vanina Jasmine (2011) Why are some more peer than others? Evidence from a longitudinal study of social networks and individual academic performance. Social Science Research, 40 (6). pp. 1506-1520. ISSN 0049-089X (doi:10.1016/j.ssresearch.2011.06.010)