List all the paper that the journal "Theoretical Computer Science
" published in 2003.
'Theoretical Computer Science' is the FullName; paper refers to Title; published in 2003 refers to Year = 2003
SELECT DISTINCT T1.Title FROM Paper AS T1 INNER JOIN Journal AS T2 ON T1.JournalId = T2.Id WHERE T2.FullName = 'Theoretical Computer Science' AND T1.Year = 2003 AND T1.Title <> ''