Imamura, Mariko, and Sachio Nakamizo. “An Empirical Test of Formal Equivalence Between Emmert’s Law and the Size-Distance Invariance Hypothesis”. The Spanish Journal of Psychology 9, no. 2 (November 24, 2006): 295–299. Accessed November 18, 2024. https://revistas.ucm.es/index.php/SJOP/article/view/SJOP0606220295A.