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h-index and g-index


h-index
Jorge Hirsch proposed the h-index or Hirsch index in 2005

"A scientist has index h if h of his or her Np papers have at least h citations each and the other (Np – h) papers have ≤h citations each. "
Hirsch, J. (2005) "An index to quantify an individual's scientific research output". PNAS 105 (46): 16569-165 DOI

g-index
Leo Egghe proposed the g-index in 2006 for quantifying the scientific productivity of physicists and other scientists based on their publication record.

"A set of papers has a g-index g if g is the highest rank such that the top g papers have, together, at least g2 citations. This also means that the top g + 1 papers have less than (g + 1)2 papers."
Egghe, L. (2006) “Theory and practise of the g-index”. Scientometrics 69(1):131-152. DOI

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