References
Hansson, S. O.: 1989, ‘A Note on the Deontic System DL of Jones and Pörn’,Synthese 80, 427–428.
Jones, A. J. I. and I. Pörn: 1985, ‘Ideality, Sub-Ideality and Deontic Logic’,Synthese 65, 275–90.
Jones, A. J. I. and I. Pörn: 1986, ‘“Ought” and “Must”’,Synthese 66, 89–93.
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Jones, A.J.I., Pörn, I. A rejoinder to Hansson. Synthese 80, 429–432 (1989). https://doi.org/10.1007/BF00869585
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DOI: https://doi.org/10.1007/BF00869585