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Greenlee, Mark W. and Thomas, J. P. (1993) Simultaneous discrimination of the spatial frequency and contrast of periodic stimuli. Journal of the Optical Society of America A: Optics, Image Science & Vision (JOSA A) 10 (3), pp. 395-404.
Greenlee, Mark W. and Thomas, J. P. (1992) Effect of pattern adaptation on spatial frequency discrimination. Journal of the Optical Society of America A: Optics, Image Science & Vision (JOSA A) 9 (6), pp. 857-862.