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3. On a consistency theorem connected with the generalized continuum hypothesis.;Hajnal;Acta Mathematica Academiae Scientiarum Hungaricae,1961
4. A. Levy, Definability in axiomatic set theory I. Logic, Methodology and Philosophy of Science, proceedings of the 1964 International Congress (Y. Bar-Hillel Ed.), Amsterdam, 1965, pp. 127–151.