Database: academic
Question: return me the paper in Databases area with the most citations .
SQL:
SELECT t3.title FROM DOMAIN AS t2 JOIN domain_publication AS t1 ON t2.did  =  t1.did JOIN publication AS t3 ON t3.pid  =  t1.pid WHERE t2.name  =  "Databases" ORDER BY t3.citation_num DESC LIMIT 1;