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22. Letter: The contrast sensitivity of the peripheral visual field to drifting sinusoidal gratings. Sharpe CR. Vision Res; 1974 Sep; 14(9):905-6. PubMed ID: 4420088 [No Abstract] [Full Text] [Related]
23. The influence of subthreshold inducing fields on the detection of discs: an empirical test of the element contribution hypothesis. Gelade GA, Beurle RL. Vision Res; 1973 Nov; 13(11):2065-78. PubMed ID: 4763519 [No Abstract] [Full Text] [Related]