A citation index keeps track of which articles in scientific journals cite which other articles. The most well-known and widely-used citation index is the Web of Science published by the Institute for Scientific Information (ISI).
A citation index such as CiteSeer or ACM Portal can be used as one way to assess and maximize the measurable impact of your own publications. To an extend, it also facilitates exploratory research when one is looking for unfilled niches.
This brings me to my question for discussion:
What citation index do you use, and why?
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