* T. Porter and T. Duff, " Compositing Digital Images ", Proceedings of SIGGRAPH ' 84, 18 ( 1984 ).
* T. Porter and T. Duff, " Compositing Digital Images ", Proceedings of SIGGRAPH ' 84, 18 ( 1984 ).
* T. Porter and T. Duff, " Compositing Digital Images ", Proceedings of SIGGRAPH ' 84, 18 ( 1984 ).
* T. Porter and T. Duff, " Compositing Digital Images ", Proceedings of SIGGRAPH ' 84, 18 ( 1984 ).
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