@INPROCEEDINGS{Lazebnik2006a,
  author = {Lazebnik, S. and Schmid, C. and Ponce, J.},
  title = {Beyond Bags of Features: Spatial Pyramid Matching for Recognizing
	Natural Scene Categories},
  booktitle = {IEEE Conference on Computer Vision and Pattern Recognition},
  year = {2006},
  volume = {II},
  pages = {2169-2178},
}