Gentzen, G., & Szabo, M. E. (1969). The collected papers of Gerhard Gentzen. North-Holland.
Cita Chicago Style (17a ed.)Gentzen, Gerhard, y M. E. Szabo. The Collected Papers of Gerhard Gentzen. Amsterdam [etc.]: North-Holland, 1969.
Cita MLA (9a ed.)Gentzen, Gerhard, y M. E. Szabo. The Collected Papers of Gerhard Gentzen. North-Holland, 1969.
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