Scientific outputs from Serbia, Croatia and Slovenia, and the patterns of co-authorship between them and five western countries
and with each other have been determined from theScience Citation Index. They reflect accurately the political situation underlying the recent break-up of the former Yugoslavia, and long-term international
alliances and friendships, but also take account of geographical proximity, which assists scientific co-operation. There is
no evidence of changes in the ethnic composition of Serbian and Croatian scientists overall, as revealed by the names of their
researchers before and after the civil war. However some changes appear to have taken place in Serbia outwith Belgrade, which
are consistent with the reports of the expulsion of Croats living in Vojvodina.