Citator
Citation index of legal resources / From Wikipedia, the free encyclopedia
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In legal research, a citator is a citation index of legal resources, one of the best-known of which in the United States is Shepard's Citations. Given a reference of a legal decision, a citator allows the researcher to find newer documents which cite the original document and thus to reconstruct the judicial history of cases and statutes. A citator can also be used to determine whether a statute or regulation has been amended, repealed, superseded, or held unconstitutional. Using a citator in this way is colloquially referred to as "Shepardizing".