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year = {2013},  organization = {IEEE},  }  @incollection{li2013head,  title = {{A head pose tracking system using RGB-D camera}},  author = {Li, Songnan and Ngan, King Ngi and Sheng, Lu},  booktitle = {Computer Vision Systems},  pages = {153--162},  year = {2013},  publisher = {Springer},  }