Nicoleta Preda Fabian M. Suchanek Gjergji Kasneci Thomas Neumann Maya Ramanath Gerhard Weikum ANGIE: Active Knowledge for Interactive Exploration. 1570-1573 2009 2 PVLDB 2 http://www.vldb.org/pvldb/2/vldb09-411.pdf db/journals/pvldb/pvldb2.html#PredaSKNRW09