Structured Penumbral Irradiance Computation
IEEE Transactions on Visualization and Computer Graphics, Volume 2, Number 4 - Dec 1996
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@Article{DF96, author = "Drettakis, George and Fiume, Eugene", title = "Structured Penumbral Irradiance Computation", journal = "IEEE Transactions on Visualization and Computer Graphics", number = "4", volume = "2", month = "Dec", year = "1996", url = "http://www-sop.inria.fr/reves/Basilic/1996/DF96" }