SEARCHES Combine Searches enables
you to combine search sets created from General
Search, Cited Reference Search, Structure
Search, and Advanced
Search during the current search session.
this example, the search sets from a General Search and a Cited
Reference Search have been combined to create a third set. The third
set finds all the articles about vostok ice (set #1) that
have cited specific articles by T Sowers (set #2).