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Research Impact Metrics


The i10-index was created by Google Scholar and is included in Google Scholar author profiles.

i10-index = the number of publications with 10 or more citations


The g-index is a variation of the h-index.

"The g-index g is the largest rank (where papers are arranged in decreasing order of the number of citations they received) such that the first g papers have (together) at least g2 citations" (Egghe, 2006).

Unlike the h-index, the g-index is strongly affected by highly-cited items.


Egghe, L. (2006) Theory and practice of the g-index. Scientometrics, 69(1): pp131-152.


The e-index is a complementary metric to the h-index. It is designed to account for citations in excess of the h-index and provides a means for differentiation between researchers with the same h-index.

A geometrical explanation of the e-index (Zhang, 2009)


Zhang C-T (2009) The e-Index, Complementing the h-Index for Excess Citations. PLoS ONE 4(5): e5429. doi:10.1371/journal.pone.0005429