Watkins, W. Targets and Backgrounds: Characterization and Representation V. SPIE Digital Library.
Tohutoru Kātū Chicago (17th ed.)Watkins, Wendell. Targets and Backgrounds: Characterization and Representation V. SPIE Digital Library.
Tohutoro MLA (9th ed.)Watkins, Wendell. Targets and Backgrounds: Characterization and Representation V. SPIE Digital Library.
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