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You want a document relevant to your topic. You may use an article or book that your professor has assigned in order to find related works. Ideally your seed document will be important in your field so that it leads you to a wide body of related works.
What is Citation Chaining?
Citation chaining is a research technique in which you use one source, called a seed document, as a way to find related documents.
There are two types of citation chaining:
Forward Chaining - Starting with one work - the "seed document" - and looking at the works that have cited the seed document as a reference. You can then continue following forward the works that have cited those documents.
Backward Chaining - Looking at what documents a seed document cites and then following those backward by looking at the documents they cite.
Citation chaining can help you trace back to the roots of important ideas or movements or start from the beginning stages and see how things grow. It's also useful for finding related documents on a topic.