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Define Bibliographic Coupling
Bibliographic coupling operates on a similar principle, but in a way it is the mirror image of co-citation coupling. Bibliographic coupling links to papers that cite the same articles, so that if papers A and B both cite paper C, they may be said to be related, even though they don't directly cite each other. The more papers they been citing, the stronger their relationship is.
Co-citation Coupling is a method used to establish a subject similarity between two documents. If papers A and B are both cited by paper C, they may be said to be related to be another, even though they don't directly cite each other. If paper A and B are both cited by many other papers, they have a stronger relationship.