@misc{zhang2012multi,
title={Multi-camera head pose tracking},
author={Zhang, Zhengyou and Sankaranarayanan, Aswin C. and Zhang, Qing and Liu, Zicheng and Cai, Qin},
year={2012},
month=dec # "~25",
note={US Patent 8,339,459},
pubtype = {Patent},
}

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