Journal
SCIENTOMETRICS
Volume 84, Issue 2, Pages 431-439Publisher
SPRINGER
DOI: 10.1007/s11192-009-0099-6
Keywords
h-Index; h-Core; h-Tail; Tail-core ratio; v-Index; k-Index
Funding
- National Natural Science Foundation of China (NSFC) [70773101]
- National Natural Science Foundation of China [70673019]
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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 the k-index, defined as k = (C/P)/(C (T)/C (H)), we show that this index decreases in most practical cases. A power law model is in accordance with these practical observations.
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