Reference
Grubinger, M., Clough, P., Hanbury, A., & Müller, H. (2008). Overview of the ImageCLEFphoto 2007 Photographic Retrieval Task. In Advances in Multilingual and Multimodal Information Retrieval (pp. 433–444). Springer. http://hdl.handle.net/20.500.12708/52471