Wolfgang Gatterbauer Magdalena Balazinska Nodira Khoussainova Dan Suciu Believe It or Not: Adding Belief Annotations to Databases. 1-12 2009 2 PVLDB 1 http://www.vldb.org/pvldb/2/vldb09-115.pdf db/journals/pvldb/pvldb2.html#GatterbauerBKS09