One who cites.
Publication used to trace the history and validity of a legal case by a tabulation of some kind.
a book, or set of volumes, that allows you to determine the history of a case and to evaluate the strength of its holdings
an index or compilation listing every instance in which a legal authority has been cited
print or electronic tool that lists and analyzes cases and secondary authorities that have cited to a specific case or other authority. Shepard's and KeyCite are citators.
In legal research, a citator is a citation index of legal resources, the best-known of which 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. Using a citator in this way is colloquially referred to as "Shepardizing".