By Lubbers M.J.   in Social Networks

ISSN:0378-8733|25|4|309-332

Elsevier‎(2003)‎

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By Kuyper H.   van der Werf M.P.C.   Lubbers M.J.   in Educational Research and Evaluation

ISSN:1380-3611|6|3|181-205

Routledge Ltd‎(2000)‎

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