Wallace, John R.; Cohen, Michael F.; Greenberg, Donald P. (August 1987). "A two-pass solution to the rendering equation: A synthesis of ray tracing and radiosity methods". ACM SIGGRAPH Computer Graphics. 21 (4): 311–320. doi:10.1145/37402.37438. ISSN0097-8930.
Wallace, John R.; Cohen, Michael F.; Greenberg, Donald P. (August 1987). "A two-pass solution to the rendering equation: A synthesis of ray tracing and radiosity methods". ACM SIGGRAPH Computer Graphics. 21 (4): 311–320. doi:10.1145/37402.37438. ISSN0097-8930.