Write SQL query to solve given problem: List all the paper that the journal "Theoretical Computer Science
" published in 2003.. Keep the solution inside sql tag ```sql [SQL-Query] ```
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 <> ''