Hasso Härlen. Elementares über 2-wertige Funktionen von 2-wertigen Variabeln. Kontrolliertes Denken, Untersuchungen zum Logikkalkül und zur Logik der Einzelwissenschaften (Festschrift für Wilhelm Britzelmayr), edited by Albert Menne, Alexander Wilhelmy, and Helmut Angstl, rotaprint, Kommissions-Verlag Karl Alber, Munich1951, pp. 51–55. | The Journal of Symbolic Logic

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Hasso Härlen. Elementares über 2-wertige Funktionen von 2-wertigen Variabeln. Kontrolliertes Denken, Untersuchungen zum Logikkalkül und zur Logik der Einzelwissenschaften (Festschrift für Wilhelm Britzelmayr), edited by Albert Menne, Alexander Wilhelmy, and Helmut Angstl, rotaprint, Kommissions-Verlag Karl Alber, Munich1951, pp. 51–55.

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Hasso Härlen. Elementares über 2-wertige Funktionen von 2-wertigen Variabeln. Kontrolliertes Denken, Untersuchungen zum Logikkalkül und zur Logik der Einzelwissenschaften (Festschrift für Wilhelm Britzelmayr), edited by Albert Menne, Alexander Wilhelmy, and Helmut Angstl, rotaprint, Kommissions-Verlag Karl Alber, Munich1951, pp. 51–55.

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Hasso Härlen. Elementares über 2-wertige Funktionen von 2-wertigen Variabeln. Kontrolliertes Denken, Untersuchungen zum Logikkalkül und zur Logik der Einzelwissenschaften (Festschrift für Wilhelm Britzelmayr), edited by Albert Menne, Alexander Wilhelmy, and Helmut Angstl, rotaprint, Kommissions-Verlag Karl Alber, Munich1951, pp. 51–55.

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