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    author 		= {Shaohua Fan and Stephen Chenney and Yu-chi Lai},
    title 		= {Metropolis Photon Sampling with Optional User Guidance},
    booktitle	= {Rendering Techniques '05 (Proceedings of the 16th Eurographics Symposium on Rendering)},
    pages		= {127--138},
    location 	= {Konstanz, Germany},
    publisher 	= {Eurographics Association},
    year 		= {2005}