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@article{fan06,
    author 		= {Shaohua Fan, Stephen Chenney, Bo Hu, Kam-Wah Tsui and Yu-Chi Lai},
    title 		= {Optimizing Control Variate Estimators for Rendering},
    booktitle	= {Computer Graphics Forum (Proceedings of Eurographics 2006)},
    volume 		= {25},
    number        = {3}
    pages		= {351-358}, 
    publisher 	= {Eurographics Association},
    year 		= {2006}
}