"Citation Searching" is a term used for starting from a particular information source and finding other information sources that cite the original source in their bibliographies.
Citation Searching is the logical opposite of looking in the bibliography of the source you have in order to find related articles: you find related articles by looking for it in other bibliographies.
There are several database/search engines that allow citation searching. Among them are:
- Web of Science and Knowledge (a subscription database paid for by Drew)
- Drew's Summon service, which incorporates citation counts/searching from the Web of Science
- Google Scholar (a free web search engine for searching scholarly materials online)
- CiteSeerx at Penn State University