University of Marburg at TRECVID 2011: Semantic Indexing Task. - Markus Mühling; Khalid Ballafkir; Ralph Ewerth; Bernd Freisleben (TRECVID, 2011)

Long-Term Incremental Web-Supervised Learning of Visual Concepts via Random Savannas. - Ralph Ewerth; Khalid Ballafkir; Markus Mühling; Dominik Seiler; Bernd Freisleben (IEEE Trans. Multim., 2012)