International collaboration in science and the formation of a core group

Journal of Informetrics - Tập 2 - Trang 317-325 - 2008
Loet Leydesdorff1, Caroline S. Wagner2
1University of Amsterdam, Amsterdam School of Communications Research (ASCoR), Kloveniersburgwel 48, 1012 CX Amsterdam, The Netherlands
2SRI International, Arlington, VA 22209, USA

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