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2. Refractive radiative transfer equation
3. James Arvo. 1986. Backward Ray Tracing. In SIGGRAPH Course Notes. 259--263. James Arvo. 1986. Backward Ray Tracing. In SIGGRAPH Course Notes. 259--263.
4. James Arvo. 1993. Transfer equations in global illumination. In SIGGRAPH Course Notes. James Arvo. 1993. Transfer equations in global illumination. In SIGGRAPH Course Notes.
5. Subrahmanyan Chandrasekar. 1960. Radiative Transfer. Dover Publications Inc. ISBN 0-486-60590-6. Subrahmanyan Chandrasekar. 1960. Radiative Transfer. Dover Publications Inc. ISBN 0-486-60590-6.