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Bergström, John A. 1900. A type of pendulum chronoscope and attention apparatus. Psychological Review 7: 483-489
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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
