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Research Impact

Author level metrics

Metrics commonly used for measuring author impact include citation counts and h-indexes (or similar indexes).


  • A measure of a researcher's impact on their discipline. 
  • Also known as the Hirsch index or Hirsch number (developed by J.E. Hirsch in 2005).
  • The value of h is equal to the number of papers (N) in the list that have N or more citations, so h=14 indicates the author has published 14 articles that have each been cited at least 14 times.
  • Each database may produce a different h-index for the same scholar due to the number of journals indexed by the database.


The i10-index is a metric used in Google Scholar profiles for measuring the impact of an author's publications. i10-index means the number of scholarly publications have at least been cited 10 times. 

Citation tracking

Many article databases provide citation numbers and citing references lists for example, Scopus, Google Scholar, OVID databases, JSTOR, EBSCO, PubMed, and IEEE.

Citation counts and h-index may be used for:

  • identifying the authors you might want to cite or collaborate with
  • PBRF portfolios

Citation analysis tools

There are some key tools you can use to find the influential authors in your research field, and who has cited your published work and where. We recommend you use all three. Although they may return identical results, there is a good chance that at least one tool will find something the others do not.

Other library databases, such as EBSCO, ProQuest, Emerald, ACM Digital Library, IEEE Xplore, JSTOR, ScienceDirect, SpringerLink and Ovid, also provide citation information. These database can be used as additional tools for finding citations of your articles.

Highly cited researchers list

Every year, Web of Science publishes a list of highly cited researchers to recognise the world's influential researchers who are ranked in the top 1% by citations for their ESI field and year in Web of Science.  

2021 highly cited researchers list

Based on the papers published and cited during 2010-2020, this list includes researchers who were ranked in the top 1% for their ESI field. nineteen New Zealand researchers, including Valery Feigin from AUT, have been named the 2021 highly cited researchers.