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Co‐citation analysis is based on the assumption that all citing articles view the scientific literature from a common point‐of‐view. When a co‐citation matrix is analyzed, this assumption affects measures of the dimensionality and clustering of articles. Therefore, before a co‐citation matrix is constructed, the citing articles should be limited to those written by individuals in an invisible college.
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Elliot Noma (1984) studied this question.
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