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The Hirsch index: definitions The Hirsch index (in short h-index) was introduced by Jorge E. Hirsch (2005) as an indicator for lifetime achievement, as measured by the number of received citations. More precisely, Hirsch defined the h-index as follows: A scientist has index h if h of his/her papers have at least h citations each, and the other papers have(More)
The set of citations received by a set of publications consists of citations received by articles in the h-core and citations received by articles in the h-tail. Denoting the cardinalities of these fours sets as C, P, C H and C T we introduce the tail-core ratio (C T /C H) and show that in practical cases this ratio tends to increase. Introducing further(More)
Social network analysis (SNA) is not a formal theory in sociology but rather a strategy for investigating social structures. As it is an idea that can be applied in many fields, we study, in particular, its influence in the information sciences. Information scientists study publication, citation and co-citation networks, collaboration structures and other(More)