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International collaboration as measured by co-authorship relations onrefereed papers grew linearly from 1990 to 2005 in terms of the number ofpapers, but exponentially in terms of the number of international addresses.This confirms Persson et al.'s (2004) hypothesis of an inflation ininternational collaboration. Patterns in international collaboration in sciencecan be considered as network effects, since there is no political institutionmediating relationships at that level except for the initiatives of theEuropean Commission. During the period 2000-2005, the network of globalcollaborations appears to have reinforced the formation of a core group offourteen most cooperative countries. This core group can be expected to useknowledge from the global network with great efficiency, since these countrieshave strong national systems. Countries at the periphery may be disadvantagedby the increased strength of the core.

International Collaboration in Science and the Formation of a Core Group