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von Wright G. H.. Deontic logic. Mind, n. s. vol. 60 (1951), pp. 1–15.
Fitch, Frederic B.Volume:
17
Language:
english
Journal:
The Journal of Symbolic Logic
DOI:
10.2307/2266264
Date:
June, 1952
File:
PDF, 235 KB
english, 1952