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Publicado en: Theoria: an international journal for theory, history and foundations of science Vol. 2, N. 7-8 (1954)
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Publicado en: Theoria: an international journal for theory, history and foundations of science Vol. 3, N. 9 (1955)
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Publicado en: Theoria: an international journal for theory, history and foundations of science Vol. 3, N. 9 (1955)