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Following Henry Small in his approach to co-citation analysis, highly citedsources are seen as concept symbols of research fronts. But instead of co-citedsources I cluster citation links, which are the thematically least heterogenouselements in bibliometric studies. To obtain clusters representing topicscharacterised by concepts I restrict link clustering to citation links tohighly cited sources. Clusters of citation links between papers in apolitical-science subfield (International Relations) and 300 of their sourcesmost cited in the period 2006-2015 are constructed by a local memeticalgorithm. It finds local minima in a cost landscape corresponding to clusters,which can overlap each other pervasively. The clusters obtained are wellseparated from the rest of the network but can have suboptimal cohesion.Cohesive cores of topics are found by applying an algorithm that constructscore-periphery structures in link sets. In this methodological paper I onlydiscuss some first clustering results for the second half of the 10-yearsperiod.

Topics as Clusters of Citation Links to Highly Cited Sources: The Case of Research on International Relations