Roberts B، Harris MG، Yates TA (2005). "The roles of inducer size and distance in the Ebbinghaus illusion (Titchener circles)". Perception. ج. 34 ع. 7: 847–56. DOI:10.1068/p5273. PMID:16124270.
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Roberts B، Harris MG، Yates TA (2005). "The roles of inducer size and distance in the Ebbinghaus illusion (Titchener circles)". Perception. ج. 34 ع. 7: 847–56. DOI:10.1068/p5273. PMID:16124270.