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Lapid, Einat; Ulrich, Rolf; Rammsayer, Thomas (2008). On estimating the difference limen in duration discrimination tasks: A comparison of the 2AFC and the reminder task. Perception and psychophysics, 70(2), pp. 291-305. Austin, Tex.: Psychonomic Journals 10.3758/PP.70.2.291
Reber, Rolf; Zimmermann, Thomas D.; Wurtz, Pascal (2004). Judgments of duration, figure-ground contrast, and size for words and nonwords. Perception and psychophysics, 66(7), pp. 1105-1114. Austin, Tex.: Psychonomic Journals 10.3758/BF03196839