Citators allow you to know how the primary authority you are relying upon has been subsequently treated.
In law, the best-known citators are KeyCite which is available in Westlaw and Shepard's which is available in LexisNexis.
Uses of KeyCite
How to Access KeyCite
Meaning of Flags
History vs. Citing References
NOTE: Patent and trademark history and citing references are also available in KeyCite.
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