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Journal Article Two Kinds of Reality Get access Eugene Wigner Eugene Wigner Palmer Physical Laboratory Princeton University Search for other works by this author on: Oxford Academic PubMed Google Scholar The Monist, Volume 48, Issue 2, 1 April 1964, Pages 248–264, https://doi.org/10.5840/monist196448214 Published: 23 December 2014
E. P. Wigner (Wed,) studied this question.