1. Csurka, Gabriella; Dance, Christopher; Fan, Lixin; Willamowski, Jutta; Bray, Cédric. "Visual categorization with bags of keypoints". En: Workshop on statistical learning in computer vision, ECCV, 2004. http://www.cs.cmu.edu/~efros/courses/AP06/Papers/csurka-eccv-04.pdf
2. Visual and semantic similarity in imageNet;Thomas Deselaers,2011
3. Image annotation by leveraging the social context;Najeeb Elahi,2011