Database: authors
Question: What was the name of the paper that was published on "IEEE Transactions on Pattern Analysis and Machine Intelligence" in 2011?
SQL: SELECT T2.Title FROM Journal AS T1 INNER JOIN Paper AS T2 ON T1.Id = T2.JournalId WHERE T1.FullName = 'IEEE Transactions on Pattern Analysis and Machine Intelligence' AND T2.Year = 2011 AND T2.Title <> ''