@article{PurtillPFDL,
	Author = {Purtill, Richard L.},
	Date-Added = {2017-12-08 18:14:53 +0000},
	Date-Modified = {2017-12-19 17:22:50 +0000},
	Doi = {10.1305/ndjfl/1093891883},
	Journal = {Notre Dame Journal of Formal Logic},
	Number = {4},
	Pages = {483--490},
	Title = {Paradox-free deontic logics},
	Volume = {16},
	Year = {1975},
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