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| volume = 35
| pages = 602–604
| issue=4}}</ref> <ref>Klein, S. A., Carney, T., Barghout-Stein, L., & Tyler, C. W. (1997, June). Seven models of masking. In Electronic Imaging'97 (pp. 13-24). International Society for Optics and Photonics. </ref> <ref> Barghout-Stein, Lauren. On differences between peripheral and foveal pattern masking. Diss. University of California, Berkeley, 1999. </ref>
===Linearity versus nonlinearity===
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