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2. Ng, R., Ramamoorthi, R., Hanrahan, P.: All-frequency shadows using non-linear wavelet lighting approximation. In: SIGGRAPH 2003, pp. 376–381. ACM, New York (2003)
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4. GLUI,
http://www.cs.unc.edu/~rademach/glui/
5. Light Probes,
http://www.debevec.org/Probes