For clustering poselets and using context to enhance detection please cite:

@InProceedings{BourdevPoseletsECCV10,
  author       = "Lubomir Bourdev and Subhransu Maji and Thomas Brox and Jitendra Malik",
  title        = "Detecting People Using Mutually Consistent Poselet Activations",
  booktitle    = "European Conference on Computer Vision (ECCV)",
  year         = "2010",
  url          = "http://www.eecs.berkeley.edu/~lbourdev/poselets"
}