Question: Which papers were published in an institution in the "USA" please?
SQL: SELECT t3.title FROM authors AS t1 JOIN authorship AS t2 ON t1.authid   =   t2.authid JOIN papers AS t3 ON t2.paperid   =   t3.paperid JOIN inst AS t4 ON t2.instid   =   t4.instid WHERE t4.country   =   "USA"