The h-index has been introduced by Hirsch as a useful measure to characterize the scientific output of a researcher. I suggest a simple modification in order to take multiple co-authorship appropriately into account, by counting each paper only fractionally according to (the inverse of) the number of authors. The resulting hm-indices for eight famous physicists lead to a different ranking from the original h-indices.
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Michael Schreiber (2008) studied this question.
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