Taneva, B., Kacimi El Hassani, M., & Weikum, G.(2011). Finding Images of Rare and Ambiguous Entities (MPI-I-2011-5-002). Saarbrücken: Max-Planck-Institut für Informatik. Retrieved from http://domino.mpi-inf.mpg.de/internet/reports.nsf/NumberView/2011-5-002.