The Beam Radiance Estimate for Volumetric Photon Mapping. Jarosz, W., Zwicker, M., & Jensen, H. W. Technical Report CS2008-0914, UC San Diego, San Diego, CA, January, 2008.
bibtex   
@techreport{jarosz08beam-tech,
    author = "Jarosz, Wojciech and Zwicker, Matthias and Jensen, Henrik Wann",
    title = "The Beam Radiance Estimate for Volumetric Photon Mapping",
    institution = "UC San Diego",
    address = "San Diego, CA",
    number = "CS2008-0914",
    year = "2008",
    month = jan,
    day = "3"
}

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