Database: academic
Question: return me the number of citations of " Making database systems usable " before 2010 .
SQL:
SELECT COUNT ( DISTINCT t2.title ) FROM publication AS t3 JOIN cite AS t1 ON t3.pid  =  t1.cited JOIN publication AS t2 ON t2.pid  =  t1.citing WHERE t3.title  =  "Making database systems usable" AND t2.year  <  2010;