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Jastrow, Joseph. 1892-93. On the Judgement of Angles and Positions of Lines. American Journal of Psychology 5: 214-248
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ISSN 1866-4784: reference - xlink
Max Planck Institute for the History of Science, Berlin Institut für Information und Medien, Sprache und Kultur (I:IMSK), Universität Regensburg Fakultät Medien, Bauhaus-Universität Weimar