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 G-index

 The G-index was proposed by Leo Egghe in his paper "Theory and Practice of the G-Index" in 2006 as an improvement on the H-Index. 

G-Index is calculated this way: "Given a set of articles'' ranked in decreasing order of the number of citations that they received, the G-Index is the (unique) largest number such that the top g articles received (together) at least g^2 citations." (from Harzig's Publish or Perish Manual)

Advantages of the G-Index:

• Accounts for the performance of author's top articles.
• Helps to make more apparent the difference between authors' respective. impacts.  The inflated values of the G-Index help to give credit to lowly-cited or non-cited papers while giving credit for highly-cited papers.  

Disadvantages of the G-Index:

Introduced in 2006. and debate continues whether G-Index is superior to H-Index.  Might not be as widely accepted as H-Index. 

further reading: https://guides.library.cornell.edu/c.php?g=32272&p=203392