Database: academic
Question: return me the paper after 2000 in VLDB conference with more than 200 citations .
SQL:
SELECT t2.title FROM publication AS t2 JOIN conference AS t1 ON t2.cid  =  t1.cid WHERE t1.name  =  "VLDB" AND t2.citation_num  >  200 AND t2.year  >  2000;