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1
Publicado en: Theoria: an international journal for theory, history and foundations of science Vol. 1, N. 2 (JUL-SEP 1952)
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2
Publicado en: Theoria: an international journal for theory, history and foundations of science Vol. 2, N. 7-8 (1954)
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3
Publicado en: Theoria: an international journal for theory, history and foundations of science Vol. 3, N. 9 (1955)